EMM-IT-3 (Key and Answer) (Autosaved)

7/29/2019 EMM-IT-3 (Key and Answer) (Autosaved)

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ME2304 Engineering Metrology and Measurements

INTERNAL EXAM 3

Part A (2 marks) (10*2=20)

1. Define major and minor diameters of thread measured?

2. Differentiate between helix angle & flank angle.

3. Draw the floating carriage micrometer with description.

4. Define: Straightness of a line in two planes.

5. Define: Roundness. Name the four measurement of roundness.

6. Name the devices used for measurement of roundness.

7. What are the stylus probe instruments?

8. Name the various types of pitch errors found in screw?

9. What is the effect of flank angle error?

10What are the applications of toolmaker's microscope?

Part -B (16 marks) (5*16=80)

11. Explain the construction and working of floating carriage micrometer

12. How are the major and minor diameters of thread measured?

13. Explain the measurement of straightness and different methods in straightness

14. Explain a method used in the measurement of surface finish and flatness

15. Explain a constant chord method & base tangent method


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ME2304 Engineering Metrology and Measurements

INTERNAL EXAM 3(ANSWER KEY)

1. Define major and minor diameters of thread measured ----------2

2. Differeniate between helix angle & flank angle. ----------2

3. Draw the floating carriage micrometer with description ----------2

4. Define: Straightness of a line in two planes. ----------2

A line is said to be straight over a given length, of the variation of the distance of its

points from two planes perpendicular to each other and parallel to the direction of a

line remaining within the specified tolerance limits

5. Define: Roundness. Name the four measurement of roundness. ----------2


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It is a surface of revolution where all the surfaces intersected 'by any plane

perpendicular to a common axis in case of, cylinder and cone.

a. Heart square circle.

b. Minimum radial separation circle.

c. Maximum inscribed circle.

d. Minimum circumscribed circle.

6. Name the devices used for measurement of roundness. ----------2

1. Diametral

2. Circumferential confining gauge.

3. Rotating on center.

V-Block

Three point probe

Accurate spindle.

7. What are the stylus probe instruments? ----------2a) Profilo meter b) Taylor Hobson Talysurf

c) Tomlinson surface meter

8. Name the various types of pitch errors found in screw?

----------2

(i) Progressive error

(ii) Drunken error

(iii) Periodic error

(iv) Irregular errors.

9. What is the effect of flank angle error? ----------2

Errors in the flank cause a virtual increase in the effective diameter of a bolt and

decrease in that, of nut.

10What are the applications of toolmaker's microscope? ----------2

(i) Linear measurement (ii) Measurement of pitch of the screw (iii) Measurement of

thread angle

Part-B

Part- B(16 marks) (5*16=80)

11. Explain the construction and working of floating carriage micrometer

(6)


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(6)

(4)


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12. How are the major and minor diameters of thread measured?

(6)

(4)


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(6)


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13. Explain the measurement of straightness and different methods in straightness

(4)

(4)


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(4)


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(4)


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14. Explain a method used in the measurement of surface finish and flatness

(4)


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(6)


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(6)

15. Explain a constant chord method & base tangent method

(4)


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(4)


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(4)


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(4)


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EMM-IT-3 (Key and Answer) (Autosaved)

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