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Manufacturing Engineering Questions & Answers –Introduction to Lathe1. End of the work piece can be supported by usinga) Headstockb) Tailstockc) Tool Postd) None of the mentionedAnswer: bExplanation: Tailstock is used to support the end of the work piece in lathe machine.

2. Which of the following position of tumbler gear lever set will movecarriage towards headstock of the lathe?a) Upb) Middlec) Downd) None of the mentionedAnswer: aExplanation: Tumbler gear lever in up position moves the carriage towards theheadstock in a lathe machine.

3. Which of the following can be used to reverse the direction of lead screwrelative to the direction of spindle movement?a) Speed leverb) Feed Leverc) Tumbler gear leverd) Friction clutchAnswer: cExplanation: Tumbler gear lever is used to reverse the direction of lead screwrelative to the direction of spindle movement in lathe machine.

4. Which of the following arrangement is used in movement of carriagealong the ways?a) Rack and pinionb) Spindle mechanismc) Crank and slotted lever mechanism

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d) None of the mentionedAnswer: aExplanation: Rack and pinion mechanism is used in movement of carriage byflywheel. Rack is gear of finite diameter.

5. Which of the following have live centre?a) Tail stockb) Headstockc) Tool postd) None of the mentionedAnswer: bExplanation: Head stock has live centre and it is called live because spindle rotateshere and is not at rest during machining.

6. Which of the following is also known as Puppet head?a) Headstockb) Tailstockc) Tool Postd) None of the mentionedAnswer: bExplanation: Tailstock is also known as puppet head. It is at the back part of lathemachine.

7. Which of the following part of lathe slides along bed ways?a) Cross slideb) Saddlec) Compound restd) None of the mentionedAnswer: bExplanation: Saddle slides along bed ways in lathe machine during the process ofmachining.

8. Which of the following part of lathe move in a direction normal to the axisof spindle?a) Cross slideb) Saddlec) Compound restd) None of the mentioned

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Answer: aExplanation: Cross slide move in a direction normal to the axis of spindle during theprocess of machining in lathe machine.

9. Which of the following is used to give power feed during cutting ofthreads?a) Rack and pinionb) Planer mechanismc) Quick return mechanismd) Using spilt nutAnswer: dExplanation: Split nut are used to engage lead screw to give power feed in latheduring the process of machining in lathe machine.

10. Which of the following serves as housing for driving pulley, and backgears?a) Headstockb) Tailstockc) Tool Postd) None of the mentionedAnswer: bExplanation: Headstock has driving pulleys and back gears in lathe machine.Headstock also carries spindle and chuck for holding the work piece.

11. The tail stock set over required to turn a taper on the entire length of aworkpiece having diameters D and d isa) D – d/2Lb) D – d/Lc) D – d/2d) D – dAnswer: bExplanation: None

12. For turning internal tapers, the suitable method isa) by a form toolb) by setting over the tail stockc) by a taper turning attachmentd) none of the mentioned

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Answer: cExplanation: None

13. The tail stock set over method of taper turning is preferred fora) internal tapersb) small tapersc) long slender tapersd) steep tapersAnswer: cExplanation: None

Lathe-11. Which of the following is correct about series of range of speed in simplelathe?a) Geometric progressionb) Arithmetic progressionc) Logarithmic progressiond) Harmonic progressionAnswer: aExplanation: Geometric progression is the series of numbers having common ratio.Range of speed follow geometric progression in simple lathe.

2. Which of the following is the correct basis in designing feed gear box forscrew cutting?a) Geometric progressionb) Arithmetic progressionc) Logarithmic progressiond) Harmonic progressionAnswer: aExplanation: Geometric progression is the series of numbers having common ratio.Feed gears box have ranges following geometric progression.

3. If cutting tool travel 1000mm in the direction of feed motion with workpiece rotational speed of 500 rpm and feed rate of 0.2mm/rev, machiningtime in minutes will bea) 2

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b) 6c) 8d) 10Answer: dExplanation: Use t=L/ FN) where ‘t’ is time, ”L’ is effective length, ‘F’ is feed and ‘N’is number of revolution per second.

4. Facing of work piece of diameter 72mm is need to be done at spindlespeed of 80 rev per min at cross feed of 0.3mm/rev. The time required inminute for facing operation will bea) 2b) 1.5c) 2.5d) 3Answer: bExplanation: Time required for machining is given by, t=L/ FN) where ‘t’ is time, ”L’ iseffective length, ‘F’ is feed and ‘N’ is number of revolution per second.

5. Compound rest swiveling method in taper turning operation is mostsuitable fora) Long jobs with small taper anglesb) Short jobs with small taper anglesc) Short jobs with steep taper anglesd) Long jobs with steep taper anglesAnswer: cExplanation: Compound rest swiveling method gives less space and less revolutionand hence in taper turning operation it is most suitable for Short jobs with steeptaper angles.

6. In which of the following, tail stock method of taper turning operation willbe preferred more?a) Internal tapersb) Steep tapersc) Small tapersd) Long slender tapersAnswer: d

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Explanation: For long slender tapers, tail stock over method is most suitablebecause tail stock method give large space and large taper angle also.

7. Which of the followings is the correct type of threads used in lead screwhaving half nut in lathe which is free to rotate in both directions?a) ACME threadsb) Buttress threadsc) Whitworth threadsd) V‐threadsAnswer: aExplanation: ACME threads have greater efficiency than other profiles of threadsand hence are used in lead screw.

8. Which of the following is used to produce quality screw threads?a) Thread castingb) Thread cutting with single point toolc) Thread milling ad cutting with single point toold) Thread chasingAnswer: dExplanation: Quality screw threads are produced by using thread chasing, which is avery precise operation.

9. Which of the following can produce both external as well as internalthreads?a) Die threading with self‐opening die headsb) Thread tapping with tapsc) Thread milling and multiple‐thread cuttersd) Thread chasing with multiple‐rib chasersAnswer: cExplanation: Thread milling and multiple thread cutters are generally used forproduction of internal and external threads.

10. In surface finishing operation one should use a sharp tool with a______ feed and _______ Speed of rotation of the job.a) Minimum, minimumb) Minimum, maximumc) Maximum, maximumd) Maximum, minimum

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Answer: bExplanation: Minimum feed and maximum speed of rotation gives very smallmaterial removal rate and hence used for surface finishing operation.

Lathe-21. Which of the following is correct reason for keeping transverse forceminimum in turning of slender rod?a) To enhances surface finishb) To increase productivityc) To increase efficiency of cuttingd) To reduce undesired vibration during turningAnswer: dExplanation: Vibration is the major problem during turning of slandered rod due towhich it is advised to keep transverse force minimum during turning of slender rod.

2. Self centered chuck has ___ number of jaws.a) 10b) 1c) 2d) 3Answer: 3Explanation: 3-jaw chucks are also known as self centered chuck, hence they have3 jaws.

3. During groove cutting in a lathe, by using a parting tool, which of thefollowing forces are encountered?a) Tangentialb) Radialc) Tangential, Radial and Axiald) Tangential and RadialAnswer: cExplanation: Radial, axial and tangential forces are encountered during groovecutting on a lathe machine.

4. Which of the following will give best result for taper turning on internalsurface?

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a) Using tailstock offset methodb) Using taper attachment methodc) Using form toold) Using compound rest methodAnswer: dExplanation: Compound rest method is generally used for taper turning on internalsurfaces.

5.Lead screw of lathe have double start thread with a pitch of 4mm. Whatshould be the ratio of speed between lead screw and spindle for producinga single start thread of 2 mm pitch?a) 1:2b) 1:3c) 1:4d) 1:5Answer: cExplanation: Number of starts and pitch of lathe is directly proportional to speed ofspindle required.

6. Let screw of 2mm pitch is needed to be cut on lathe machine. Leadscrew of lathe has pitch of 6mm. Which of the following statement iscorrect?a) Speed of lead screw>speed of spindleb) Speed of lead screw<speed of spindlec) Speed of lead screw=speed of spindled) None of the mentionedAnswer: bExplanation: Speed of lead screw decreases in relative to speed of spindle as manytimes the required pitch is larger than pitch of lead screw.

7. Speed of lead screw decreases in relative to speed of spindle as manytimes the required pitch is larger than pitch of lead screw.a) Trueb) FalseAnswer: aExplanation: Lead screw will move axially equal to pitch of lead screw after onecomplete rotation of lead screw.

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8. Speed of lead screw decreases in relative to speed of spindle as manytimes the required pitch is smaller than pitch of lead screw.a) Trueb) FalseAnswer: bExplanation: Lead screw will move axially equal to pitch of lead screw after onecomplete rotation of lead screw.

9. What are thread chasers?a) Multipoint cutting toolb) Single point cutting toolc) A work holding deviced) None of the mentionedAnswer: aExplanation: Thread chasers are multipoint cutting tool used for cutting threads.

10. Total load is distributed over all teeth, when thread cutting is done usingthread chaser.a) Trueb) FalseAnswer: aExplanation: Distribution of load over all teeth is the main advantage of using threadchaser for thread cutting operation.

Lathe-31. Which of the following can be effectively used for holding eccentric job?a) Four jaw chuckb) Three jaw chuckc) Both three jaw chuck and four jaw chuckd) Two jaw chuckAnswer: aExplanation: Four jaw chucks is used for holding eccentric job because of goodmanual balancing capability of four jaws.

2. Which of the following can be effectively used for holding irregular job?a) Four jaw chuck

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b) Three jaw chuckc) Both three jaw chuck and four jaw chuckd) Two jaw chuckAnswer: aExplanation: Four jaw chucks is used for holding irregular job because of goodmanual balancing capability of four jaws.

3. Which of the following is also known as universal chuck?a) Four jaw chuckb) Three jaw chuckc) Both three jaw chuck and four jaw chuckd) Two jaw chuckAnswer: aExplanation: Four jaw chucks is used for holding eccentric job as well as irregularjob apart from holding symmetric job because of good manual balancing capabilityof four jaws.

4. Which of the following is mostly used for holding bored part of job?a) Mandrelsb) Dogsc) Colletd) Angle plateAnswer: aExplanation: Mandrels are used to hold bored job during machining process of jobs..

5. What will be the value of half taper angle in degrees if diameter of bigend is 100mm and diameter of small end is 60mm for a 1m long job?a) 3.19b) 5.29c) 1.14d) 2.29Answer: cExplanation: Half angle can be calculated by using- tan (half taper angle) = (D-d)/(2*L).

6. What will be the value of half taper angle in degrees if diameter of bigend is 500mm and diameter of small end is 60mm for a 1m long job?a) 31.10

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b) 52.30c) 31.10d) 12.40Answer: dExplanation: Half angle can be calculated using- tan (half taper angle) = (D-d)/ (2*L).

7. What will be the value of diameter of big end in mm for tapered job ifdiameter of small end and length of job is 60mm and 1m respectively?Given half taper angle is equal to 12.4 degrees.a) 600b) 500c) 400d) 300Answer: bExplanation: Big end diameter can be calculated using- tan (half taper angle) = (D-d)/ (2*L).

8. What will be the value of diameter of small end in mm for tapered job ifdiameter of big end and length of job is 60mm and 1m respectively? Givenhalf taper angle is equal to 1.14 degrees.a) 600b) 200c) 100d) 300Answer: cExplanation: Small end diameter can be calculated using- tan (half taper angle) =(D-d)/ (2*L).

9. During taper turning operation 100mm of smaller side diameter and800mm of bigger side diameter was required. What will be the value oftaper gradient for a job of 1m in length?a) 15.01b) 19.29c) 28.35d) 56.31Answer: bExplanation: Taper gradient= tan (half taper angle) = (D-d)/ (2*L).

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10. During taper turning operation 100mm of smaller side diameter and800mm of bigger side diameter was required. What will be the value ofConicity for a job of 1m in length?a) 31.20b) 23.20c) 56.32d) 38.58Answer: dExplanation: Conicity=2* tan (half taper angle) = (D-d)/ (*L).

Lathe-41. What will be the length of job in m if diameter of big end is 100mm anddiameter of small end is 60mm for a taper angle of 1.14 degree?a) 5b) 2c) 7d) 1Answer: dExplanation: Length be calculated by using- tan (half taper angle) = (D-d)/ (2*L)where ‘D’ is the external diamter, ‘d’ is the internal diameter, ‘L’ is the length of job.

2. The job of total length 300mm is tapered turned on lathe using tailstockset over method. The two diameters obtained are 80mm and 500mm andlength of taper was 200mm only. Tail stock set over is equal toa) 10b) 15c) 20d) 25Answer: bExplanation: Tail stock set over= L*(D-d)/ (2*l), where ‘D’ is the external diameter, ‘d’is the internal diameter, ‘L’ is the length of job..

3. A job of total length 800mm is tapered turned on lathe using tailstock setover method. The two diameters obtained are 450mm and 500mm andlength of taper was 700mm only. Tail stock set over is equal to

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a) 10.12b) 15.32c) 20.32d) 28.57Answer: dExplanation: Tail stock set over= L*(D-d)/ (2*l), where ‘D’ is the external diameter, ‘d’is the internal diameter, ‘L’ is the length of job..

4. A cast iron piece of total length 100mm is needed to be tapered for alength of 40mm using swiveling the compound rest method. Diameter of jobis 20mm and smaller end have nearly zero diameter. What should theangle in degrees by which compound rest should be rotated?a) 20.36b) 45.21c) 14.03d) 5.23Answer: cExplanation: tan (Angle of rotation of compound rest) = (D-d)/ (2*L), where ‘D’ is theexternal diameter, ‘d’ is the internal diameter, ‘L’ is the length of job..

5. Distance measured normal to the axis of part, between crest and root ofthread is known asa) Pitchb) Depth of threadsc) Thread angled) Major diameterAnswer: bExplanation: Depth of threads is the distance measured normal to the axis of part,between crest and root of thread.

6. Distance from one point of thread to the next corresponding point isknown asa) Pitchb) Depth of threadsc) Thread angled) Major diameterAnswer: b

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Explanation: Pitch is the distance from one point of thread to the next correspondingpoint.

7. If the nut rotated in clockwise direction and advances axially, thenthreads present in nut area) Right Handed threadedb) left handed threadc) Right handed and left handed bothd) None of the mentionedAnswer: aExplanation: In right handed thread nut rotated in clockwise direction and advancesaxially where as its reverse takes place in left handed threads.

8. Lead of nut is 2mm and has double start threads. What is the pitch ofnut?a) 1b) 2c) 3d) 6Answer: aExplanation: Pitch=lead/number of starts.

9. A thread has number of starts equal to one. Which of the following ismost correct about thread?a) Pitch > leadb) Pitch<<leadc) Pitch < leadd) Pitch=leadAnswer: dExplanation: Pitch=lead/number of starts.

10. Let screw of 10mm pitch is needed to be cut on lathe machine. Leadscrew of lathe has pitch of 6mm. Which of the following statement iscorrect?a) Speed of lead screw is greater than speed of spindleb) Speed of lead screw is less that speed of spindlec) Speed of lead screw is equal to speed of spindled) None of the mentioned

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Answer: aExplanation: Speed of lead screw increase in relative to speed of spindle as manytimes the required pitch is smaller than pitch of lead screw.

Capstan and Turret Lathe1. Which of the following lathe requires very high skills for operation?a) Centre latheb) Capstan lathec) Turret lathed) All of the mentionedAnswer: aExplanation: Centre lathe is much more typical than other lathe machines and hencerequires much more skills.

2. Which of the following have lowest degree of automation?a) Centre latheb) Capstan lathec) Turret lathed) All of the mentionedAnswer: aExplanation: Centre lathe has nominal degree of automation. Most of the operationare done manually and are not automatic.

3. Which of the following requires high labor cost?a) Turret latheb) Capstan lathec) Centre lathed) All of the mentionedAnswer: cExplanation: Centre lathe requires high labor cost because it requires good skills forperforming operations on it.

4. Which of the following offers minimum overhead charge?a) Turret latheb) Capstan lathec) Centre lathe

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d) All of the mentionedAnswer: cExplanation: Centre lathe requires low overhead charges due to small initialinvestment and low maintenance.

5. Which of the following lathe is most versatile?a) Turret latheb) Capstan lathec) Centre lathed) All of the mentionedAnswer: cExplanation: Centre lathe is capable of handling varying shape jobs and hence ismost versatile.

6. Turret head in turret lathe is generally mounted ona) Slideb) Saddlec) Ramd) None of the mentionedAnswer: bExplanation: Turret head is one of the important feature of turret lathe generallymounted on saddle.

7. Lead crew is present in turret lathe for thread cuttinga) Trueb) FalseAnswer: bExplanation: Thread cutting in turret lathe is generally produced by taps and dieheads, hence lead screw are not present in turret lathe.

8. Lead crew is present in Capstan lathe for thread cuttinga) Trueb) FalseAnswer: bExplanation: Thread cutting in turret lathe is generally produced by taps and dieheads, hence lead screw are not present in Capstan lathe.

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9. Which of the following is not much effective for mass production i.e.production of same types of job?a) Turret latheb) Capstan lathec) Centre lathed) All of the mentionedAnswer: cExplanation: Centre lathe have low degree of automation and is good in versatilejobs production.

10. Which of the following lathe requires low maintenance?a) Turret latheb) Capstan lathec) Centre lathed) All of the mentionedAnswer: cExplanation: Turret and capstan have large number of parts, hence require largeamount of maintenance.

Introduction to Milling1. Which of the following act as load bearing part of milling machine?a) Baseb) Columnc) Kneed) TableAnswer: aExplanation: Base act as support in milling machine. It is made of very strongmaterial and have good surface hardness.

2. Knee of milling machine is attached and slides up and down ona) Baseb) Columnc) Kneed) TableAnswer: a

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Explanation: Knee slide over column. Column has motor drive attached to its rearside. Base can be used as reservoir for coolant.

3. Motor drive in milling machine is generally attached toa) Baseb) Columnc) Kneed) TableAnswer: bExplanation: Column has motor drive attached to its rear side. Base can be used asreservoir for coolant. Knee slide over column.

4. Which of the following part of milling machine can be used for reservoirfor coolant?a) Baseb) Columnc) Kneed) TableAnswer: aExplanation: Base can be used as reservoir for coolant. Knee slide up and down oncolumn.

5. Which of the following is capable of sliding up and down in millingmachines?a) Baseb) Columnc) Kneed) TableAnswer: cExplanation: Knee slide up and down on column. Knee adjusts table height bysliding up and down on milling machine.

6. Which of the following part movement of milling machines helps inadjustment of table height?a) Baseb) Columnc) Kneed) Table

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Answer: cExplanation: Knee adjusts table height by sliding up and down on milling machine.Knee slide up and down on column.

7. Which of the following part of milling machine is used to support workpiece?a) Baseb) Columnc) Kneed) TableAnswer: dExplanation: Table is used to support work piece. Cast iron has very good surfacehardness and hence used for table of milling machine.

8. Table of milling machine is generally made up ofa) Cast ironb) Steelc) Aluminumd) None of the mentionedAnswer: aExplanation: Cast iron has very good surface hardness and hence used for table ofmilling machine. Table is used to support work piece.

9. Which of the following carries clamping bolt T-slots for fixing work piece?a) Baseb) Columnc) Kneed) TableAnswer: aExplanation: Table is used to work piece and hence has T slots for clamping bolts.Cast iron has very good surface hardness and hence used for table of millingmachine. Table is used to support work piece.

10. Which of the following is the heavy support provided at the top of bothplain and universal milling machine?a) Baseb) Over armc) Knee

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d) TableAnswer: bExplanation: Over arm act as heavy support provided at the top. Table is used tosupport work piece. Base can be used as reservoir for coolant.

Milling Cutters1. Which of the following milling cutters have teeth only on their periphery?a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: aExplanation: Plain milling cutters have teeth only on their periphery.

2. Which of the following milling cutters have teeth on their periphery aswell as on their one side or both the side?a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: bExplanation: Side milling cutters have teeth on their periphery as well as on their oneside or both the side. They can cut from both the sides.

3. Which of the following milling cutters have teeth on their periphery aswell as on their end?a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: cExplanation: End milling cutters have teeth on their periphery as well as on theirend. They are used in end milling or periphery milling.

4. Which of the following milling cutters have teeth on their periphery aswell as on their end face?

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a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: dExplanation: Face milling cutters have teeth on their periphery as well as on theirend face. They are used in face milling operations.

5. In face milling cutters, maximum cutting is done by the teeth onperiphery.a) Trueb) FalseAnswer: aExplanation: Maximum cutting in face milling cutter is generally done by the teeth onits periphery.

6. In face milling cutters, teeth on end face perform a type of finishingoperation during cutting.a) Trueb) FalseAnswer: aExplanation: Maximum cutting in face milling cutter is generally done by the teeth onits periphery and teeth on end face generally perform finishing operation.

7. Which of the following milling cutters can be use for cutting thin slots orfor parting off operations?a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Metal slitting cuttersAnswer: dExplanation: Metal slitting cutters can be use for cutting thin slots or for parting offoperations.

8. Which of the following milling cutters can be used for formation of V-grooves?a) Angle milling cuttersb) Form milling cutters

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c) Gear cuttersd) Woodruff-key cutterAnswer: aExplanation: As V is a angular shape, angle milling cutters can be used for theformation of V-grooves.

9. Woodruff Key milling cutter is a type ofa) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: cExplanation: Woodruff Key milling cutter is a small type of End milling cutters.Theseare special types of cutters.

10. Which of the following milling cutter is capable of removable of largematerial with very small power consumption?a) Plain milling cuttersb) Side milling cuttersc) End milling cuttersd) Face milling cuttersAnswer: aExplanation: Plain milling cutters have low power consumption but high materialremoval rate.

Milling Attachment1. Arbors in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: aExplanation: Arbors are standard attachments used to hold cutters. They are used inmilling operation to hold the milling cutters.

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2. Collets in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: aExplanation: Collets are standard attachments and used to hold milling cutters. Theyare used in milling operation to hold the milling cutters.

3. Adaptors in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: aExplanation: Adaptors are standard attachments and used to hold milling cutters.They are used in milling operation to hold the milling cutters.

4. Vice circular table in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: bExplanation: Vice circular table are standard attachments and used to hold the workpiece on table. They are used in milling operation to hold the workpiece.

5. Indexing head in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: bExplanation: Indexing head are standard attachments and used to hold the workpiece on table. They are used in milling operation to hold the workpiece.

6. Tailstock in milling machines are generally used toa) Hold cutters

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b) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: bExplanation: Tailstock is standard attachment and used to hold the work piece ontable. They are used in milling operation to hold the milling cutters.

7. Spiral milling attachment in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: cExplanation: Spiral milling attachment is standard attachment and act as auxiliaryspindle.

8. Vertical milling attachment in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: cExplanation: Vertical milling attachment is standard attachment and act as auxiliaryspindle.

9. Slotting milling attachment in milling machines are generally used toa) Hold cuttersb) Hold the work piece on tablec) Act as auxiliary spindled) None of the mentionedAnswer: cExplanation: Slotting milling attachment is standard attachment and act as auxiliaryspindle.

10. Which of the following is not a standard milling attachment?a) Arborsb) Colletsc) Jigs and fixture

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d) AdaptorsAnswer: cExplanation: Jigs and fixture are special attachments used in milling operations.

Milling Operations-11. Which of the following milling operation can be used for machining a flatsurface, parallel to the axis of cutter?a) Slab millingb) Face millingc) Angular millingd) Form millingAnswer: aExplanation: Slab milling operation can be used for machining a flat surface, parallelto the axis of cutter. It uses face cutters.

2. Which of the following milling operation can be used for machining of flatsurface which is right angle to the axis of cutter?a) Slab millingb) Face millingc) Angular millingd) Form millingAnswer: bExplanation: Face milling operation can be used for machining a flat surface,perpendicular to the axis of cutter. It may use periphery cutters or face cutters.

3. Which of the following milling operation can be used for machining of flatsurface which is at some angle to the axis of cutter?a) Slab millingb) Face millingc) Angular millingd) Form millingAnswer: cExplanation: Angular milling operation can be used for machining a flat surface,which is at some angle to the axis of cutter.

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4. Which of the following milling process is used for machining of irregularshapes?a) Slab millingb) Face millingc) Angular millingd) Form millingAnswer: dExplanation: Form milling operation can be used for machining Irregular surface. Ituses special form cutters.

5. Which of the following milling process is used for machining of twoparallel vertical surface of a job simultaneously?a) Key way millingb) Groove millingc) Gang millingd) Straddle millingAnswer: dExplanation: Straddle milling operation can be used for machining of two parallelvertical surface of a job simultaneously.

6. Which of the following milling process is used for machining of number offlat horizontal and vertical surfaces simultaneously using more than twocutters at the same time mounted on common arbor?a) Key way millingb) Groove millingc) Gang millingd) Straddle millingAnswer: cExplanation: Gang milling uses multiple cutters. All the cutter works simultaneouslyduring the milling operation.

7. Which of the following milling operation can be used for producinggrooves in work piece?a) Key way millingb) Groove millingc) Gang millingd) Straddle milling

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Answer: bExplanation: Groove milling can be used for producing grooves in work piece.

8. Which of the following operation can be used for parting of work piece intwo pieces?a) Key way millingb) Groove millingc) Saw millingd) Straddle millingAnswer: cExplanation: Saw milling can be used for parting off operations. It uses specialmilling cutters.

9. In which of the following milling cutters, power requirement will increaseslightly?a) Negative rake angle toolb) Positive rake angle toolc) Both positive and negative rake angle toold) None of the mentionedAnswer: bExplanation: Power requirement for positive rake angle tool is generally more thannegative rake angle tool.

10. Which of the following cutter can be used for finishing of previouslymilled slot?a) Key way milling cutterb) Dovetail milling cutterc) Saw milling cutterd) Slitting milling cutterAnswer: bExplanation: Dovetail milling cutters are used for finishing previously milled slots.

Milling Operations-21. Diameter of milling cutter is 100 mm, running at 210 rpm. Cutting speedin m/min is equal toa) 26

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b) 23c) 66d) 78Answer: cExplanation: V= (3.14*D*N)/1000. V is the cutting speed, D is diameter and N is therevolution per minute.

2. Distance moved by table in mm in one minute in any direction is knownasa) Feed per minuteb) Feed per toothc) Feed per revolutiond) None of the mentionedAnswer: aExplanation: Distance moved by table in mm in one minute in any direction is knownas feed per minute.

3. Distance moved by table in mm during time when cutter revolve throughangle corresponding to distance between two cutting edges of two adjacentteeth is known asa) Feed per minuteb) Feed per toothc) Feed per revolutiond) None of the mentionedAnswer: bExplanation: Distance moved by table in mm during time when cutter revolvesthrough angle corresponding to distance between two cutting edges of two adjacentteeth is known as feed per tooth.

4. In a milling operation, feed per tooth is 0.020 mm and total number ofteeth on milling cutter is 50. Feed per revolution in mm is equal toa) 0.2b) 1.4c) 1.0d) 0.7Answer: cExplanation: Feed per revolution= feed per tooth * number of teeth.

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5. In a milling operation, feed per revolution is 5 mm and total number ofteeth on milling cutter is 50. Feed per tooth in mm is equal toa) 0.1b) 0.2c) 0.5d) 0.05Answer: aExplanation: Feed per revolution= feed per tooth * number of teeth.

6. In a milling operation, feed per revolution is 0.05 mm and speed of 400rpm. Feed per min in mm/min is equal toa) 1b) 2c) 0.5d) 0.05Answer: bExplanation: Feed per minute= feed per revolution* speed.

7. In a milling operation, feed per min is 10 mm and speed of 500 rpm.Feed per min in mm/min is equal toa) 1b) 2c) 0.5d) 0.04Answer: dExplanation: Feed per minute= feed per revolution* speed.

8. In a milling operation feed per tooth is .002 mm and number of teeth is50 rotating with 60 rpm. Feed per min in mm/min is equal toa) 3b) 4c) 6d) None of the mentionedAnswer: cExplanation: Feed per minute= feed per tooth* speed*number of teeth.

9. In a milling operation feed per tooth is .002 mm and number of teeth is30 rotating with 40 rpm. Feed per min in mm/min is equal to

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a) 3b) 4.3c) 2.4d) None of the mentionedAnswer: cExplanation: Feed per minute= feed per tooth* speed*number of teeth.

10. In a milling operation feed per revolution is 10 mm/rev and number ofteeth is 50 rotating with 10 rpm. Feed per tooth in mm is equal toa) .02b) .04c) .06d) None of the mentionedAnswer: aExplanation: Feed per minute= feed per tooth* speed*number of teeth.

Milling Methods1. In which of the following milling method cutters rotate in directionopposite to that in which work is fed?a) Up millingb) Climb millingc) Down millingd) None of the mentionedAnswer: aExplanation: In up milling cutters rotate in direction opposite to that in which work isfed.

2. In which of the following milling method chip thickness increasegradually?a) Up millingb) Climb millingc) Down millingd) None of the mentionedAnswer: a

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Explanation: In up milling chip thickness increase gradually whereas in down millingchip thickness decreases gradually.

3. In which of the following milling method chip thickness decreasegradually?a) Up millingb) Conventional millingc) Down millingd) None of the mentionedAnswer: cExplanation: In down milling chip thickness decreases gradually whereas in upmilling chip thickness increase gradually.

4. In which of the following milling method chip thickness is nearly zero atthe start of cut?a) Up millingb) Climb millingc) Down millingd) None of the mentionedAnswer: aExplanation: In up milling chip thickness increase gradually from zero at the start ofcut to the maximum value at the end.

5. In which of the following milling method chip thickness is maximum at theend of cut?a) Up millingb) Climb millingc) Down millingd) None of the mentionedAnswer: aExplanation: In up milling chip thickness increase gradually whereas in down millingchip thickness decreases gradually.

6. In which of the following milling method chip thickness is nearly zero atthe end of cut?a) Up millingb) Conventional millingc) Down milling

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d) None of the mentionedAnswer: bExplanation: In down milling chip thickness decrease gradually from maximum at thestart of cut to the zero at the end.

7. Which of the following will result in best surface finish of job?a) Up millingb) Conventional millingc) Down millingd) None of the mentionedAnswer: cExplanation: Down milling gives better surface finish than up milling. In down millingchip thickness decrease gradually from maximum at the start of cut to the zero at theend.

8. In which of the following methods work piece will have tendency to bepulled up?a) Up millingb) Climb millingc) Down millingd) None of the mentionedAnswer: aExplanation: In up milling cutters rotate in direction opposite to that in which work isfed. Upward force is acted on work piece by tool.

9. In which of the following methods of milling there would be less radialpressure on the arbor?a) Up millingb) Conventional millingc) Down millingd) None of the mentionedAnswer: cExplanation: Down milling generates less radial pressure. In down milling chipthickness decrease gradually from maximum at the start of cut to the zero at theend.

10. Which of the following milling operation will require lower force of cut?a) Up milling

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b) Climb millingc) Down millingd) None of the mentionedAnswer: cExplanation: In up milling large force is generate due to opposite motion of tool andwork piece. In up milling chip thickness increase gradually whereas in down millingchip thickness decreases gradually.

Indexing by Milling1. Dividing head are generally used for changing angular position of workpiece relative to milling cutter.a) Trueb) FalseAnswer: aExplanation: Indexing head are also known as dividing head and are used forchanging angular position of work piece relative to milling cutter.

2. Which of the following is precision dividing head used in milling?a) Plain dividing headb) Universal dividing headc) Optical dividing headd) None of the mentionedAnswer: cExplanation: Optical dividing heads are precision heads and are used in precisionindexing work. Indexing head are also known as dividing head and are used forchanging angular position of work piece relative to milling cutter.

3. Circumference of a work piece is to be divided in 8 equal division usingindex plate of 24 slots. Indexing ratio is equal toa) 2b) 3c) 4d) 6Answer: b

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Explanation: Indexing ratio = (number of slots on index plate)/ (number of divisionrequired). Hence indexing ratio is equal to 3.

4. Circumference of a work piece is to be divided in 10 equal division usingindex plate of 550 slots. Indexing ratio is equal toa) 2b) 3c) 5d) 6Answer: bExplanation: Indexing ratio = (number of slots on index plate)/ (number of divisionrequired). Hence indexing ratio is equal to 3.

5. Circumference of a work piece is to be divided into 60 equal divisionsusing simple indexing method having 40 worm wheel teeth. Indexingmovement will bea) 12 holes on 18 hole circleb) 16 holes on 18 hole circlec) 12 holes on 21 hole circled) 16 holes on 21 hole circleAnswer: aExplanation: Indexing movement = (40)/ (number of division required).Henceindexing movement is equal to 12 holes on 18 hole circle.

6. Circumference of a work piece is to be divided into 35 equal divisionsusing simple indexing method having 40 worm wheel teeth. Indexingmovement will bea) 3 holes on 18 hole circleb) 16 holes on 18 hole circlec) 3 holes on 21 hole circled) 16 holes on 21 hole circleAnswer: cExplanation: Indexing movement = (40)/ (number of division required). Henceindexing movement is equal to 3 holes on 21 hole circle.

7. Circumference of a work piece is to be divided into 6 equal divisionsusing direct indexing method. Indexing movement will bea) 5

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b) 2c) 3d) 4Answer: dExplanation: Indexing movement = (24)/ (number of division required). Henceindexing movement is equal to 4.

8. Circumference of a work piece is to be divided into 12 equal divisionsusing direct indexing method. Indexing movement will bea) 5b) 2c) 3d) 4Answer: bExplanation: Indexing movement = (24)/ (number of division required). Henceindexing movement is equal to 2.

9. What will be the index movement to mill a hexagon head screw by usingdirect indexing?a) 2b) 3c) 4d) 6Answer: cExplanation: For direct indexing, indexing movement = (24)/ (number of divisionrequired). Hence indexing movement is equal to 4.

10. Which one of the following is correct about compound indexing of 93divisions?a) 28 holes in 21 circle forward and 28 holes in 31 circle backwardsb) 26 holes in 21 circle forward and 28 holes in 30 circle backwardsc) 28 holes in 21 circle forward and 28 holes in 30 circle backwardsd) None of the mentionedAnswer: aExplanation: For compound Indexing use (40/N) = ((n1/N1) + – (n2/N2)), where Ndenotes the number of division.Hence indexing movement is equal to 28 holes in 21circle forward and 28 holes in 31 circle backwards.

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Geometry of Twist Drills-11. Part of twist drill which carries flutes and extends from dead centre up tothe start of neck is known asa) Bodyb) Pointc) Lipd) Chisel edgeAnswer: aExplanation: Body of twist drill carries flutes and extends from dead centre up to thestart of neck. This is the longest part of twist drill.

2. Part of drill between neck and tang is known asa) Bodyb) Pointc) Shankd) Chisel edgeAnswer: cExplanation: Shank of twist drill is between neck and tang.

3. Edge formed at extreme tip due to intersection of flanks, is known asa) Bodyb) Pointc) Lipd) Chisel edgeAnswer: dExplanation: Chisel edge is formed at extreme tip due to intersection of flanks. It isat the extreme edge of chisel edge.

4. Cone shaped surface formed at the end of the flutes which containsdead centre, lips and flanks etc. is known asa) Bodyb) Pointc) Lipd) Chisel edgeAnswer: b

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Explanation: Point is a Cone shaped surface formed at the end of the flutes whichcontains dead centre, lips and flanks etc. It is at the end part of the twist drill.

5. Main cutting part of drill isa) Bodyb) Pointc) Lipd) Chisel edgeAnswer: cExplanation: Lip is the main cutting part of drill and is also called cutting edge.Material removed first at chisel edge.

6. Intersection of each faces and flank forma) Bodyb) Pointc) Lipd) Chisel edgeAnswer: aExplanation: Lip is the main cutting part of drill and is also called cutting edge. It isformed at Intersection of each faces and flank.

7. Small clearance provided in diameter of twist drills adjacent to land isknown asa) Body clearanceb) Point clearancec) Lip clearanced) Chisel edge clearanceAnswer: aExplanation: Body clearance is provided in diameter of twist drills adjacent to land.This clearance help in the removal of material during cutting.

8. Which of the following help in reducing friction between drill and the wallsof the hole in twist drills?a) Body clearanceb) Point clearancec) Lip clearanced) Chisel edge clearanceAnswer: a

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Explanation: Body clearance reduces friction between drill and the walls. It helps insmooth drilling of holes during the operation.

9. Narrow flat surface running along flutes of twist drill on its leading edge isknown asa) Bodyb) Pointc) Lipd) LandAnswer: dExplanation: Land is the narrow flat surface running along flutes of twist drill on itsleading. It is the flat part of twist drill.

10. Narrow flat surface running along flutes of twist drill on its leading edgeis known asa) Bodyb) Pointc) Lipd) MarginAnswer: dExplanation: Margin is the narrow flat surface running along flutes of twist drill on itsleading. It is also known as land.

Geometry of Twist Drills-2This set of Manufacturing Engineering Questions for entrance examsfocuses on “Geometry of Twist Drills”.

1. Small part of conical surface of a point which is grounded to providerelief near the cutting edge in twist drills is known asa) Lip clearanceb) Facec) Fluted) FlankAnswer: aExplanation: Lip clearance is a Small part of conical surface of a point which isgrounded to provide relief near the cutting edge.

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2. In twist drills, curved surface of flute near the lip is known asa) Lip clearanceb) Facec) Fluted) FlankAnswer: bExplanation: Face is the curved surface of flute near the lip. Lip clearance is a Smallpart of conical surface of a point which is grounded to provide relief near the cuttingedge.

3. In twist drills helical grooves in the body of drill is calleda) Lip clearanceb) Facec) Fluted) FlankAnswer: cExplanation: Flutes are grooves in the body of drill. These grooves are helical inshape. They provide passage for chip flow.

4. Which of the following part of twist drill is responsible for making chipscurl and provide passage for chip flow?a) Lip clearanceb) Facec) Fluted) FlankAnswer: cExplanation: Flutes are grooves in the body of drill. These grooves are helical inshape. They provide passage for chip flow.

5. In twist drills, curved surface on either side of dead centre, confinedbetween lip on its on its one side and face of the flute on its other side iscalleda) Lip clearanceb) Facec) Fluted) FlankAnswer: d

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Explanation: Flank is on either side of dead centre. Curved surface on either side ofdead centre, confined between lip on its on its one side and face of the flute on itsother side is called flank.

6. Which of the following separate flute from each other in twist drills?a) Webb) Chisel edge cornerc) Outer cornerd) NeckAnswer: aExplanation: Web is a central metal column and separates flutes.

7. In twist drills, chisel edge and lip intersect ata) Webb) Chisel edge cornerc) Outer cornerd) NeckAnswer: bExplanation: Chisel edge corner is the point where chisel edge and lip intersects.

8. In twist drills, face and flank intersect at corner at the extreme of deadcentre, that corner is known asa) Webb) Chisel edge cornerc) Outer cornerd) NeckAnswer: cExplanation: At outer corner face and flak intersects. Face and flank intersect atcorner at the extreme of dead centre, that corner is known as outer corner.

9. Which of the following part of twist drill separates body from shank?a) Webb) Chisel edge cornerc) Outer cornerd) NeckAnswer: dExplanation: Neck separates body and shank.

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10. In twist drills, end of tapered shank is attached toa) Webb) Chisel edge cornerc) Outer cornerd) TangAnswer: dExplanation: Tang is a flat portion with rectangular cross section provided at the endof shank.

11. In twist drills, Edge formed by intersection of body clearance and flute isknown asa) Webb) Chisel edge cornerc) Heeld) NeckAnswer: cExplanation: Heel is a edge formed by intersection of body clearance and flute.

Geometry of Twist Drills-31. Length measured along the axis between the dead centre and start ofneck of a twist drill is known asa) Body lengthb) Flute lengthc) Lip lengthd) Overall lengthAnswer: aExplanation: Body length is the length measured along the axis between the deadcentre and start of neck. Flute length is the length measured parallel to the axisbetween the dead centre and the point of termination of flute near the neck.

2. Length measured parallel to the axis between the dead centre and thepoint of termination of flute near the neck is known asa) Body lengthb) Flute lengthc) Lip length

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d) Overall lengthAnswer: bExplanation: Flute length is the length measured parallel to the axis between thedead centre and the point of termination of flute near the neck. Body length is thelength measured along the axis between the dead centre and start of neck.

3. In twist drill, distance measured between the chisel edge corner and theouter corner is known asa) Body lengthb) Flute lengthc) Lip lengthd) Overall lengthAnswer: cExplanation: Lip length is the length measured between the chisel edge corner andthe outer corner. Body length is the length measured along the axis between thedead centre and start of neck.

4. In twist drills, length measured along the axis between the dead centreand the extreme end of tang is known asa) Body lengthb) Flute lengthc) Lip lengthd) Overall lengthAnswer: dExplanation: Overall length is the length measured along the axis between the deadcentre and the extreme end of tang. Body length is the length measured along theaxis between the dead centre and start of neck.

5. Reduction in body diameter measured along radius of twist drill is knownasa) Body lengthb) Lead of helixc) Depth of body clearanced) Core taperAnswer: cExplanation: Depth of body clearance is reduction in body diameter measured alongradius of twist drill.

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6. Web taper is also known asa) Body lengthb) Lead of helixc) Depth of body clearanced) Core taperAnswer: dExplanation: Core taper is the increase in core thickness. Web taper is also knownas core taper.

7. Measure of increase in web thickness or core thickness, starting from theminimum at the point end to the maximum at the shank end of twist drilla) Body lengthb) Lead of helixc) Depth of body clearanced) Core taperAnswer: dExplanation: Core taper or web taper is the measure of increase in web thickness orcore thickness, starting from the minimum at the point end to the maximum at theshank end of twist drill.

8. Axial distance measured between two corresponding points on a flute inits one complete turn in twist drill is known asa) Body lengthb) Lead of helixc) Depth of body clearanced) Core taperAnswer: bExplanation: Lead helix is the axial distance measured between two correspondingpoints on a flute in its one complete turn in twist drill.

9. Rake angle of drill is also asa) Taper angleb) Friction anglec) Helix angled) None of the mentionedAnswer: cExplanation: Helix angle of drill is also known as rake angle. Lead helix is the axial

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distance measured between two corresponding points on a flute in its one completeturn in twist drill.

10. Which of the following is correct about helix angle for right hand flutedrill?a) Positiveb) Negativec) Zerod) None of the mentionedAnswer: aExplanation: Helix angle have positive value for right handed flute. Helix angle of drillis also known as rake angle.

Geometry of Twist Drills-41. Which of the following is correct about helix angle for left hand flute drill?a) Positiveb) Negativec) Zerod) None of the mentionedAnswer: bExplanation: Helix angle have negative value for right handed flute.

2. Which of the following is correct about helix angle for parallel flute drill?a) Positiveb) Negativec) Zerod) None of the mentionedAnswer: cExplanation: Helix angle have zero value for right handed flute.

3. Which of the following drill is most suitable for softer material?a) 48 degree helix angle drillb) 68 degree helix angle drillc) 58 degree helix angle drilld) 18 degree helix angle drillAnswer: d

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Explanation: Helix angle with lower value are more suitable for soft material. Helixangle have negative value for right handed flute.

4. When the value of helix angle increases in drills, the value of requiredtorque for rotation of drill willa) Increaseb) Decreasec) First increase then decreased) First decrease then increaseAnswer: bExplanation: Torque required is inversely proportional to helix angle of drill. Whenthe value of helix angle increases in drills, the value of required torque for rotation ofdrill will increase.

5. Point angle of drill is also known asa) Taper angleb) Friction anglec) Helix angled) Cutting angleAnswer: cExplanation: Point angle of drill is also known as cutting angle. Small point angledrills are favored for brittle material because brittle material has low chip flow. Smallpoint angle makes drill strong. But it reduces the passage area for chip flow.

6. Which of the following drill will be most suitable for drilling of brittlematerial?a) Small point angle drillb) Large point angle drillc) Zero point angles drilld) None of the mentionedAnswer: aExplanation: Small point angle drills are favored for brittle material because brittlematerial has low chip flow. Small point angle makes drill strong. But it reduces thepassage area for chip flow. Point angle of drill is also known as cutting angle.

7. Which of the following drill will be most suitable for drilling of ductile andsoft material?a) Small point angle drill

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b) Large point angle drillc) Zero point angles drilld) None of the mentionedAnswer: bExplanation: Large point angle drills are favored for ductile material because ductilematerial has high chip flow. Large point angle makes drill weak but increase chipflow passage area. Point angle of drill is also known as cutting angle.

8. Clearance in drill isa) Directly proportional to chisel edge angleb) Inversely proportional to chisel edge anglec) Does not depend on chisel edge angled) None of the mentionedAnswer: aExplanation: Greater the chisel edge angle larger will be the clearance.

9. For drilling of brass work piece, most suitable rake angle in degrees fordrill will bea) 12b) 15c) 0d) -9Answer: cExplanation: Brass is neither brittle nor ductile and hence zero rake angle ispreferred for drilling of brass work piece.

10. Which of the following is most suitable range of lip clearance angel indegrees for drilling of aluminum work piece?a) 8-12b) 3-2c) 50-60d) None of the mentionedAnswer: aExplanation: 8 degree to 12 degree is the best range of lip clearance angle for mostof the operations.

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Drilling1. Producing circular hole in a solid metal by means of revolving tool isknown asa) Drillingb) Reamingc) Boringd) Counter boringAnswer: aExplanation: Drilling is defined as production of generally circular hole by using arevolving tool.

2. Operation of finishing previously drilled hole in order to bring it toaccurate size and have good surface finish is known asa) Drillingb) Reamingc) Boringd) Counter boringAnswer: bExplanation: Reaming is a finishing operation of drilled hole. It is done to improvesurface finish of drilled hole.

3. Process of enlarging the hole size and enhancing its surface finish isknown asa) Drillingb) Reamingc) Boringd) Counter boringAnswer: cExplanation: Once the hole is drilled by using drilling operation, later the diameter ofhole can be increased by using boring operation.

4. Process of enlarging only a small part of hole is also known asa) Drillingb) Reamingc) Boringd) Counter boring

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Answer: dExplanation: Once the hole is drilled by using drilling operation, later the diameter ofsome part of hole can be increased by using counter boring operation.

5. Operation of enlarging the end of hole to give conical shape at end isknown asa) Drillingb) Reamingc) Boringd) Counter sinkingAnswer: dExplanation: Once the hole is drilled by using drilling operation, later the ends ofhole can be machined into conical shape for proper adjustment of washer or othermachine parts by using Counter sinking operation.

6. Operation used to form internal threads is known asa) Drillingb) Reamingc) Boringd) TappingAnswer: dExplanation: Tapping is the process of forming internal threads by means of toolcalled tap.

7. If ‘D’ is hole diameter, then general value for compulsory approach forthrough hole can be taken asa) 0.3*Db) 0.1*Dc) 0.5*Dd) 0.8*DAnswer: cExplanation: For through hole, X = 0.5*D.

8. If ‘D’ is hole diameter, then general value for compulsory approach forblind hole can be taken asa) 0.3*Db) 0.1*Dc) 0.5*D

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d) 0.8*DAnswer: aExplanation: For through hole, X = 0.3*D.

9. If 20mm hole is needed to be drilled using a drill having semi point angleof 15 degrees. Value of compulsory approach in mm isa) 37.2b) 45.3c) 87.1d) 13.3Answer: aExplanation: X = (D/2)/ (tan (semi point angle)).

10. If 20mm hole is needed to be drilled using a drill having point angle of15 degrees. Value of compulsory approach in mm isa) 37.2b) 45.3c) 75.95d) 13.3Answer: cExplanation: X = (D/2)/ (tan (semi point angle)). Semi point angle = point angle/2.

Reaming1. Helical groves on body of reamers are known asa) Flutesb) Facec) Heeld) RecessAnswer: aExplanation: Flutes are helical grooves present on body of reamers. They help inbetter machining process using reamers.

2. In reamers, flute surface adjacent to cutting is known asa) Flutesb) Facec) Heel

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d) RecessAnswer: bExplanation: Face of reamers is adjacent to cutting edge. They help in cutting duringmachining process using reamers.

3. Small flat surface in between cutting edge and the heel of a reamer isknown asa) Flutesb) Facec) Heeld) LandAnswer: dExplanation: Land is the small narrow surface between cutting edge and heel. Theyhelp in better machining process using reamers.

4. In reamers, edge formed by intersection of secondary clearance andflute is known asa) Flutesb) Facec) Heeld) RecessAnswer: cExplanation: Heel is the edge formed by intersection of secondary clearance andflute. They help in better machining process using reamers.

5. Reduction in body diameter toward shank of reamer is known asa) Flutesb) Facec) Heeld) RecessAnswer: dExplanation: Recess is the reduction in body diameter toward shank. They help inbetter machining process using reamers.

6. Maximum diameter of reamer at entering is also known asa) Flutesb) Facec) Actual size

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d) RecessAnswer: cExplanation: Actual size of reamer is the maximum diameter of reamer.

7. Portion of reamer which carries flute is known asa) Flutesb) Facec) Bodyd) RecessAnswer: cExplanation: Body carries flute on it. Face of reamers is adjacent to cutting edge.

8. Tapered of reamer by which it can be gripped is known asa) Flutesb) Facec) Heeld) ShankAnswer: dExplanation: Shank is used for gripping reamers and rotating. Face of reamers isadjacent to cutting edge.

9. Longitudinal center line which is concentric with diameter of reamer isknown asa) Flutesb) Axisc) Heeld) RecessAnswer: bExplanation: Axis divides reamers in two symmetric part.

10. If reamer is found to be cutting while rotating in clockwise directionwhen viewed against the entering end at right angle to it is known asa) Left handed reamerb) Central reamerc) Right handed reamerd) None of the mentionedAnswer: a

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Explanation: Left handed reamer rotate in clockwise during cutting when viewedagainst the entering end at right angle.

11. If reamer is found to be cutting while rotating in anti-clockwise directionwhen viewed against the entering end at right angle to it is known asa) Left handed reamerb) Central reamerc) Right handed reamerd) None of the mentionedAnswer: cExplanation: Right handed reamer rotate in anti-clockwise during cutting whenviewed against the entering end at right angle.

Grinding Wheel-11. Grain number of grinding wheel is ___ to grain size.a) Directly proportionalb) Inversely proportionalc) Does not dependd) None of the mentionedAnswer: bExplanation: Grain number = 1/(grain size). Grain number is similar to density ofgrains on grinding wheels.

2. Which of the following is correct range for grain number of grindingwheel for coarse grains?a) 220-600b) 80-180c) 30-60d) 10-24Answer: dExplanation: For coarse grain, grain number ranges from 10 to 24.

3. Which of the following is correct range for grain number of grindingwheel for medium grains?a) 220-600b) 80-180

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c) 30-60d) 10-24Answer: cExplanation: For medium grain, grain number ranges from 30 to 60.

4. Which of the following is correct range for grain number of grindingwheel for fine grains?a) 220-600b) 80-180c) 30-60d) 10-24Answer: bExplanation: For fine grains, grain number ranges from 80 to 180.

5. Which of the following is correct range for grain number of grindingwheel for very fine grains?a) 220-600b) 80-180c) 30-60d) 10-24Answer: aExplanation: For very fine grains, grain number ranges from 220 to 600.

6. Which of the following grinding machine will give better result for roughmachining?a) Fine grainb) Very fine grainc) Coarse graind) None of the mentionedAnswer: cExplanation: Coarse grain wheel will give better metal removal rate and space forchip removal as rate of chip flow in rough machining is high.

7. Which of the following grinding machine will give better result for finishmachining operation?a) Fine grainb) Medium grainc) Coarse grain

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d) None of the mentionedAnswer: cExplanation: Fine grain wheel will give smaller metal removal rate and hence betterfor finishing operations.

8. Which of the following symbols range of alphabet represent soft grain ingrinding wheel?a) A – Hb) I – Pc) Q – Td) T – ZAnswer: aExplanation: A-H represents soft grains in grinding wheel.

9. Which of the following symbols range of alphabet represent mediumhardness grain in grinding wheel?a) A – Hb) I – Pc) Q – Td) T – ZAnswer: bExplanation: I-P represents medium hard grains in grinding wheel.

10. Which of the following symbols range of alphabet represent hard grainin grinding wheel?a) D – Hb) I – Pc) A – Dd) Q – ZAnswer: aExplanation: A-H represents soft grains in grinding wheel.

Grinding Wheel-21. Which of the following range of numbers represents dense structure ofabrasives?a) 0-7

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b) 8-10c) 10-12d) 12-16Answer: aExplanation: 0 – 7 represents dense structures. It represents distance between thegrain in grinding wheel.

2. Which of the following range of numbers represents open structure ofabrasives?a) 0-3b) 4-6c) 8-16d) None of the mentionedAnswer: cExplanation: 8 – 16 represents open structure. It represents distance between thegrain in grinding wheel.

3. Which of the following represents correct symbol of vertified bond inspecification of grinding wheel?a) Vb) Rc) Bd) SAnswer: aExplanation: ‘V’ represents for vertified bond. Fifth place of ISO designation ofgrinding wheel represents type of bond.

4. Which of the following represents correct symbol of rubber bond inspecification of grinding wheel?a) Vb) Rc) Bd) SAnswer: bExplanation: ‘R’ represents for rubber bond. Fifth place of ISO designation ofgrinding wheel represents type of bond.

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5. Which of the following represents correct symbol of Resin bond inspecification of grinding wheel?a) Vb) Rc) Bd) SAnswer: bExplanation: ‘B’ represents for resin bond. Fifth place of ISO designation of grindingwheel represents type of bond.

6. Resin bond is also knowna) Vertified bondb) Rubber bondc) Silicate bondd) Bakelite bondAnswer: dExplanation: Resin bond is also known as Bakelite bond and is represented bysymbol ‘B’. Fifth place of ISO designation of grinding wheel represents type of bond.

7. Which of the following represents correct symbol of Silicate bond inspecification of grinding wheel?a) Vb) Rc) Bd) SAnswer: dExplanation: ‘S’ represents for Silicate bond. Fifth place of ISO designation ofgrinding wheel represents type of bond.

8. Which of the following represents correct symbol of Shellac bond inspecification of grinding wheel?a) Vb) Pc) Bd) SAnswer: b

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Explanation: ‘P’ represents for shellac bond. Fifth place of ISO designation ofgrinding wheel represents type of bond.

9. Which of the following represents correct symbol of epoxy bond inspecification of grinding wheel?a) Vb) Rc) Pd) SAnswer: bExplanation: ‘P’ represents for epoxy bond. Fifth place of ISO designation of grindingwheel represents type of bond.

10. Which of the following will be better to use for machining of hard workpiece?a) V-bondb) R-bondc) Both V and R bondd) None of the mentionedAnswer: aExplanation: Vertified bond grinding wheel is generally used for machining of hardwork piece. Fifth place of ISO designation of grinding wheel represents type of bond.

Grinding Wheel-31. Which of the following will be better to use for machining of soft workpiece?a) V-bondb) R-bondc) Both V and R bondd) None of the mentionedAnswer: bExplanation: Rubber bond grinding wheel is generally used for machining of softwork piece. Fifth place of ISO designation of grinding wheel represents type of bond.

2. Which of the following grinding wheel would be more economical forgrinding of hard work piece?

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a) Soft grinding wheelb) Hard grinding wheelc) Both hard and soft grinding wheeld) None of the mentionedAnswer: aExplanation: In soft grinding wheels, during machining of hard work piece glazingwill occur after long time.

3. Which of the following grinding wheel would be more economical forgrinding of soft work piece?a) Soft grinding wheelb) Hard grinding wheelc) Both hard and soft grinding wheeld) None of the mentionedAnswer: bExplanation: In hard grinding wheels, during machining of soft work piece glazingwill occur after long time and grains of grinding wheel will be effectively utilize beforecoming out from the wheel.

4. Which of the following grinding wheel would be more economical forgrinding of hard work piece?a) Open structure grinding wheelb) Dense structure wheelc) Both dense and open structure grinding wheeld) None of the mentionedAnswer: bExplanation: In dense structure grinding wheels, during machining of hard workpiece material removal rate is small and also wheel have good strength.

5. Which of the following grinding wheel would be more economical forgrinding of soft work piece?a) Open structure grinding wheelb) Dense structure wheelc) Both dense and open structure grinding wheeld) None of the mentionedAnswer: aExplanation: In open structure grinding wheels, during machining of soft work piece

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material removal rate is large and space for chip flow is also large due to morespace between grains of wheel.

6. Material removal rate of grinding process in comparison to materialremoval rate in facing on lathe isa) Smallb) Largec) Samed) Can’t say about material removal rateAnswer: aExplanation: Material removal rate in grinding process is very small. Hence grindingis mostly use as finishing process. Only small portion of abrasives are involved ingrinding process and hence has less material removal rate.

7. Material removal rate in grinding operation is small due toa) Negative rake angleb) Positive rake anglec) Zero rake angled) Material removal rate does not depend on rake angleAnswer: aExplanation: Grinding wheel have negative rake angle and hence have very smallmaterial removal rate. Hence grinding is mostly use as finishing process.

8. Material removal rate in grinding operation is small due toa) Only small portion of abrasives are involved in cuttingb) Positive rake anglec) Zero rake angled) Material removal rate does not depend on rake angleAnswer: aExplanation: Only small portion of abrasives are involved in grinding process andhence has less material removal rate. Hence grinding is mostly use as finishingprocess.

9. Material removal rate in grinding operation is small due toa) Large portion of abrasives are involved in cuttingb) Positive rake anglec) Due to temperature rise during grindingd) Material removal rate does not depend on rake angle

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Answer: cExplanation: Due to increase in temperature during grinding operation some materialget welded again with the chip.

10. Grinding ratio generally lies betweena) 0.5-10b) 100-200c) 1000-200d) 30-40Answer: aExplanation: Grinding ratio = (volume of material removed/volume of wheel wear).G.R is generally between 0.5-10.

Grinding-11. Grinding wheel is specified as “A 46 K 5 B 17”. Grain size of wheel willbea) Coarseb) Mediumc) Fined) Very FineAnswer: bExplanation: ’46’ represents grain size, which is medium grain size. Second value inthe specification represents grain size.

2. Grinding wheel is specified as “C 8 K 5 B 17”. Grain size of wheel will bea) Coarseb) Mediumc) Fined) Very FineAnswer: aExplanation: ‘8’ represents grain size, which is coarse. Second value in thespecification represents grain size.

3. Grinding wheel is specified as “A 600 K 5 B 17”. Grain size of wheel willbea) Coarse

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b) Mediumc) Fined) Very FineAnswer: dExplanation: ‘600’ represents grain size, which comes under very fine grain size.Second value in the specification represents grain size.

4. Which of the following grinding wheel will have fine grain size?a) A 46 K 5 B 17b) C 600 K 5 B 17c) C 8 K 5 B 17d) A 80 K 5 B 17Answer: dExplanation: Second place of ISO designation of grinding wheel represents grainsize and “80” comes under fine rain size.

5. Which of the following grinding wheel will have fine grain size?a) A 46 K 5 B 17b) C 600 K 5 B 17c) C 8 K 5 B 17d) A 80 K 5 B 17Answer: cExplanation: Second place of ISO designation of grinding wheel represents grainsize and “600” comes under very fine rain size.

6. Which of the following specified grinding wheel will have Aluminum oxideabrasive?a) Z 46 K 5 B 17b) C 600 K 5 B 17c) C 8 K 5 B 17d) A 80 K 5 B 17Answer: dExplanation: First place of ISO designation of grinding wheel represents grain typeand “A” represents aluminum oxide.

7. Which of the following specified grinding wheel will have Zirconiaabrasive?a) Z 46 K 5 B 17

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b) C 600 K 5 B 17c) C 8 K 5 B 17d) A 80 K 5 B 17Answer: aExplanation: First place of ISO designation of grinding wheel represents grain typeand “Z” represents Zirconia.

8. Which of the following specified grinding wheel will have Silicon carbideabrasive?a) Z 46 K 5 B 17b) C 600 K 5 B 17c) A 8 K 5 B 17d) A 80 K 5 B 17Answer: bExplanation: First place of ISO designation of grinding wheel represents grain typeand “C” represents silicon carbide.

9. Operation done to make periphery of grinding wheel concentric with itsaxis to recover its lost shape is known asa) Loadingb) Glazingc) Dressingd) TrueingAnswer: dExplanation: Trueing is done to make periphery of grinding wheel concentric with itsaxis and to recover its lost shape.

10. Removing dull grains in order to make grinding wheel sharp is knownasa) Loadingb) Glazingc) Dressingd) TrueingAnswer: cExplanation: Dressing is done to make grinding wheel shaft by removing dull grainsat top.

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Grinding-21. Which of the following grinding wheel specified in ISO designation willrepresent Vitrified bond?a) Z 46 K 5 E 17b) C 600 K 5 B 17c) C 8 K 5 R 17d) A 80 K 5 V 17Answer: dExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “V” represents Vitrified bond type.

2. Grinding wheel specified as “C 8 K 5 R 17” in ISO designation. What isthe type of bond present in grinding wheel?a) Vitrifiedb) Rubberc) Shellacd) EpoxyAnswer: bExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “R” represents rubber.

3. Which of the following grinding wheel specified in ISO designation willrepresent Resin bond?a) Z 46 K 5 E 17b) C 600 K 5 B 17c) C 8 K 5 R 17d) A 80 K 5 V 17Answer: bExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “B” represents resin bond.

4. Which of the following grinding wheel specified in ISO designation willrepresent Shellac bond?a) Z 46 K 5 E 17b) C 600 K 5 B 17c) C 8 K 5 R 17

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d) A 80 K 5 V 17Answer: aExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “E” represents shellac.

5. Grinding wheel specified as “A 8 K 5 P 17” in ISO designation. What isthe type of bond present in grinding wheel?a) Vitrifiedb) Rubberc) Shellacd) EpoxyAnswer: dExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “P” represents rubber.

6. Which of the following will not have open structure?a) A 46 K 5 B 17b) C 600 K 8 B 17c) C 8 K 5 9 17d) A 80 K 10 B 17Answer: aExplanation: Fourth place of ISO designation of grinding wheel represents Structureand “5” comes under dense structure.

7. Which of the following has open structure?a) A 46 K 5 B 17b) C 600 K 8 B 17c) C 8 K 5 3 17d) A 80 K 4 B 17Answer: bExplanation: Fourth place of ISO designation of grinding wheel represents Structureand “8” comes under open structure.

8. A grinding wheel is specified as “C 10 K 8 R 17”. Which of the followingis correct about this grinding wheel?a) Very fine grainsb) Open structurec) Aluminum oxide abrasive

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d) Coarse grainAnswer: bExplanation: Fourth place of ISO designation of grinding wheel represents Structureand “8” comes under open structure.

9. A grinding wheel is specified as “A 5 K 5 R 17”. Which of the following iscorrect about this grinding wheel?a) Very fine grainsb) Open structurec) Aluminum oxide abrasived) Coarse grainAnswer: cExplanation: First place of ISO designation of grinding wheel represents grain typeand “A” represents aluminum oxide.

10. A grinding wheel is specified as “C 5 K 5 R 17”. Which of the followingis correct about this grinding wheel?a) Very fine grainsb) Open structurec) Rubber bondd) Coarse grainAnswer: cExplanation: Fifth place of ISO designation of grinding wheel represents type ofbond and “R” represents rubber.

11. A grinding wheel is specified as “A 8 K 5 P 17”. Which of the followingis correct about this grinding wheel?a) Very fine grainsb) Open structurec) Rubber bondd) Coarse grainAnswer: dExplanation: ‘8’ represents grain size, which is coarse.

12. Friability of grinding wheel is associated toa) Hardnessb) Fracturec) Size

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d) None of the mentionedAnswer: bExplanation: Friability is the ability to fracture under pressure so that when cuttingedge become dull, the grain breaks off and exposes new grains which are sharp.

13. With time, grinding wheel starts rubbing work piece instead of cutting,due to decrease in sharpness. This phenomenon is known asa) Loadingb) Glazingc) Dressingd) TrueingAnswer: bExplanation: Glazing occurs when grinding wheel starts rubbing work piece insteadof cutting.

14. Loss in sharpness of grinding wheel due to presence of chips in gaps ofgrains is termed asa) Loadingb) Glazingc) Dressingd) TrueingAnswer: aExplanation: Loading decrease sharpness of grinding wheel, when foreign materialcomes in between free space of wheel.

Surface Finishing Operations1. Which of the following is a surface finishing operation?a) Drillingb) Honingc) Millingd) TurningAnswer: bExplanation: Honing is a surface finishing operation used to give better surface finishand have very small material removal rate.

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2. Which of the following is a surface finishing operation?a) Drillingb) Lappingc) Millingd) TurningAnswer: bExplanation: Lapping is a surface finishing operation used to give better surfacefinish and have very small material removal rate.

3. Which of the following process has lowest cutting speed?a) Drillingb) Honingc) Millingd) TurningAnswer: bExplanation: Honing is a surface finishing operation and hence it is generallyperformed at low speed.

4. Which of the following process has lowest cutting speed?a) Slottingb) Lappingc) Millingd) ReamingAnswer: bExplanation: Lapping is a surface finishing operation and hence it is generallyperformed at low speed.

5. Which of the following process have lowest metal removal rate?a) Drillingb) Reamingc) Millingd) LappingAnswer: bExplanation: Lapping is a surface finishing operation and hence have low metalremoval rate.

6. Which of the following process have lowest metal removal rate?a) Drilling

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b) Reamingc) Millingd) HoningAnswer: dExplanation: Honing is a surface finishing operation and hence have low metalremoval rate.

7. Which of the following is correct grain size range of abrasive grains forhoning stones?a) 800 grit to 1000 gritb) 5 grit to 10 gritc) 50 grit to 60 gritd) 80 grit to 600 gritAnswer: dExplanation: 80 grit to 600 grit is the correct grain size range of abrasive grains forhoning stones.

8. For practical honing conditions, cross hatch angle in degrees is generallytaken in the range ofa) 20 to 40b) 40 to 50c) 50 to 60d) 10 to 15Answer: aExplanation: Cross hatch angle is generally taken from 20 degree to 40 degree.

9. During a honing process, reciprocating speed of honing tool was 9m/minwith a rotary speed of 25m/min. Cross hatch angle in degrees is equal toa) 40b) 35c) 30d) 25Answer: aExplanation: tan(X) = (Reciprocating speed in m/min)/ (Rotary speed in m/min).Cross hatch angle = 2*X, where ‘X’ is the cross hatch angle.

10. During a honing process, reciprocating speed of honing tool was9m/min with a cross hatch angle of 30 degree. Rotary speed in m/min is

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equal toa) 33.58b) 35c) 30d) 25.23Answer: aExplanation: tan(X) = (Reciprocating speed in m/min)/ (Rotary speed in m/min).Cross hatch angle = 2*X, where ‘X is the cross hatch angle.

Metrology-11. Maximum deviation in size of shaft or hole is known asa) Toleranceb) Fundamental deviationc) Clearanced) InterferenceAnswer: aExplanation: Tolerance is the maximum deviation in size of shaft or hole.

2. Nearest deviation between hole and shaft from the basic value is knownasa) Toleranceb) Fundamental deviationc) Clearanced) InterferenceAnswer: bExplanation: Tolerance is the maximum deviation in size of shaft or hole.

3. When size of smallest hole is more than size of biggest shaft then it isa) Clearance fitb) Interference fitc) Transition fitd) None of the mentionedAnswer: aExplanation: When size of smallest hole is more than size of biggest shaft then it isclearance fit.

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4. Value of minimum clearance is given bya) Size of smallest hole – size of biggest shaftb) Size of smallest hole + size of biggest holec) Size of smallest shaft – size of biggest shaftd) None of the mentionedAnswer: aExplanation: Minimum clearance is the difference between size of smallest hole andsize of biggest shaft.

5. Value of maximum clearance is given bya) Size of smallest hole – size of biggest holeb) Size of smallest shaft + size of biggest holec) Size of smallest shaft – size of biggest shaftd) None of the mentionedAnswer: bExplanation: Maximum clearance is given by sum of size of biggest hole andsmallest shaft.

6. When size of smallest shaft is more than size of biggest hole then it isa) Clearance fitb) Interference fitc) Transition fitd) None of the mentionedAnswer: bExplanation: When size of smallest shaft is more than size of biggest hole then it isinterference fit.

7. Value of maximum Interference is given bya) Size of smallest hole – size of biggest shaftb) Largest of shaft size hole – smallest hole sizec) Size of smallest shaft – size of biggest shaftd) None of the mentionedAnswer: bExplanation: Maximum Interference is the difference between size of largest haftsize and smallest hole size.

8. Value of minimum interference is given bya) Size of smallest hole – size of biggest hole

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b) Size of smallest shaft + size of biggest holec) Size of smallest shaft – size of biggest holed) None of the mentionedAnswer: cExplanation: Minimum interference is the difference between size of smallest shaftand size of biggest hole.

9. For manufacturing of certain amount of hole, maximum hole size wasfound to be 50.14 mm and minimum hole size was found to be 49.98.Tolerance in mm will bea) 0.12b) 0.13c) 0.16d) 0.20Answer: cExplanation: Tolerance is the maximum deviation in size of shaft or hole.

10. In manufacturing of hole and shaft, maximum shaft diameter was 49.88mm and minimum hole diameter was found to be 49.94 mm. It is aa) Clearance fitb) Interference fitc) Transition fitd) None of the mentionedAnswer: aExplanation: When size of smallest hole is more than size of biggest shaft then it isclearance fit.

Metrology-21. In an assembly of hole and shaft, smallest hole was having diameter of49.98 mm and largest shaft was having diameter of 49.94 mm. Minimumclearance in mm will bea) .08b) .03c) .001d) .04

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Answer: dExplanation: Minimum clearance is the difference between size of smallest hole andsize of biggest shaft. Maximum clearance is given by sum of size of biggest hole andsmallest shaft.

2. In an assembly of hole and shaft, smallest shaft was having diameter of49.98 mm and largest hole was having diameter of 50.14 mm. Maximumclearance in mm will bea) 0.23b) 0.26c) 0.32d) 0.12Answer: bExplanation: Maximum clearance is given by sum of size of biggest hole andsmallest shaft. Minimum clearance is the difference between size of smallest holeand size of biggest shaft.

3. In an assembly of hole and shaft, largest shaft was having diameter of50.18 mm and smallest hole was having diameter of 49.98 mm. Maximuminterference in mm will bea) 0.2b) 0.3c) 0.3d) 0.1Answer: aExplanation: Maximum Interference is the difference between size of largest haftsize and smallest hole size. Minimum interference is the difference between size ofsmallest shaft and size of biggest hole.

4. In an assembly of hole and shaft, minimum shaft diameter is 49.36 mmand maximum shaft diameter is 48.20 mm. It is an example ofa) Clearance fitb) Interference fitc) Transition fitd) None of the mentionedAnswer: bExplanation: When size of smallest shaft is more than size of biggest hole then it is

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Interference fit. Maximum Interference is the difference between size of largest haftsize and smallest hole size.

5. In an assembly of hole and shaft, smallest shaft was having diameter of50.16 mm and largest hole was having diameter of 50.14 mm. Minimuminterference in mm will bea) 0.2b) 0.3c) 0.3d) 0.1Answer: aExplanation: Minimum interference is the difference between size of smallest shaftand size of biggest hole. Maximum Interference is the difference between size oflargest haft size and smallest hole size.

6. Maximum material limit of shaft isa) Maximum diameter of holeb) Maximum diameter of shaftc) Smallest diameter of holed) Minimum diameter of shaftAnswer: bExplanation: Maximum material limit of shaft is maximum diameter of shaft.Minimum material limit of shaft is minimum diameter of shaft.

7. Maximum material limit of hole isa) Maximum diameter of holeb) Maximum diameter of shaftc) Smallest diameter of holed) Minimum diameter of shaftAnswer: cExplanation: Maximum material limit of hole is smallest diameter of hole. Minimummaterial limit of hole is largest diameter of hole.

8. Minimum material limit of shaft isa) Maximum diameter of holeb) Maximum diameter of shaftc) Smallest diameter of holed) Minimum diameter of shaft

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Answer: dExplanation: Minimum material limit of shaft is minimum diameter of shaft. Maximummaterial limit of shaft is maximum diameter of shaft.

9. Minimum material limit of hole isa) Maximum diameter of holeb) Maximum diameter of shaftc) Smallest diameter of holed) Minimum diameter of shaftAnswer: cExplanation: Minimum material limit of hole is largest diameter of hole. Maximummaterial limit of hole is smallest diameter of hole.

10. Allowance of hole and shaft assembly is equal toa) Sum of maximum metal limitb) Product of Maximum limitc) Difference of maximum metal limitd) None of the mentionedAnswer: cExplanation: Allowance of hole and shaft assembly is equal to difference ofmaximum metal limit.