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Mechanical Engineering :: Engineering

Materials

@ :Home>Mechanical Engineering>Engineering Materials> Section 1

Exercise

Section1

Section 2 Section 3 Section 4 Section 5 Section 6

"If you judge

people, you have

no time to lovethem."

- Mother Teresa

1. Specify the sequence correctlyA.Grain growth, recrystallisation, stress relief

B.Stress relief, grain growth, recrystallisation

C.Stress relief, recrystallisation, grain growth

D.Grain growth, stress relief, recrystallisationAnswer & Explanation

Answer:Option C

Explanation:

No answer description available for this question.Let us discuss.

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2. Thermoplastic materials are those materials which

A.are formed into shape under heat and pressure and results in a permanently hard

product

B.do not become hard with the application of heat and pressure and no chemicalchange occurs

C.are flexible and can withstand considerable wear under suitable conditions

D.are used as a friction lining for clutches and brakes

Answer & Explanation

Answer:Option B
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Explanation:



3. Which of the following material has maximum ductility?

A.Mild steel

B.CopperC.Nickel

D.Aluminium


Answer:Option A

Explanation:



4. An eutectoid steel consists of

A.wholly pearliteB.wholly austenite

C.pearlite and ferrite

D.pearlite and cementite


Answer:Option A

Explanation:



5. Shock resisting steels should have

A.low wear resistance

B.

low hardnessC.low tensile strength

D.toughness


Answer:Option D
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Materials


Exercise

Section 1 Section 2 Section 3 Section 4 Section 5 Section 6

"To err is human;to forgive,

divine."

- Alexander Pope

6. Cast iron is aA.ductile material

B.malleable material

C.brittle material

D.tough material


Answer:Option C

Explanation:



7. The hardness is the property of a material due to which itA.can be drawn into wires

B.breaks with little permanent distortion

C.can cut another metal

D.can be rolled or hammered into thin sheets


Answer:Option C

Explanation:



8. Malleable cast iron is produced
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A.by adding magnesium to molten cast iron

B.by quick cooling of molten cast iron

C.from white cast iron by annealing process

D.none of these


Answer:Option C

Explanation:



9. Smelting is the process ofA.removing the impurities like clay, sand etc. from the iron ore by washing with water

B.expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in

shallow kilns

C.reducing the ore with carbon in the presence of a flux

D.all of the above


Answer:Option C

Explanation:



10. The percentage of carbon in cast iron varies fromA.0.1 to 0.5

B.0.5 to 1
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C.1 to 1.7

D.1.7 to 4.5


Answer:Option D

Explanation:



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Verbal Ability GK Puzzles Engineering Interview Online Test


Materials


Exercise


"Loneliness is the

most terrible

poverty."

- Mother Teresa

11. The ability of a material to absorb energy in the plastic range is calledA.resilience

B.creep

C.fatigue strength

D.toughness


Answer:Option A

Explanation:



12. Brass is an alloy ofA.copper and zinc

B.copper and tin

C.copper, tin and zinc

D.none of these


Answer:Option A
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Explanation:



13. A material is said to be allotropic, if it hasA.fixed structure at all temperatures

B.atoms distributed in random pattern

C.different crystal structures at different temperatures

D.any one of the above


Answer:Option C

Explanation:



14. Closed packed hexagonal space lattice is found inA.zinc, magnesium, cobalt, cadmium, antimony and bismuth

B.gamma-iron, aluminium, copper, lead, silver and nickel

C.alpha-iron, tungsten, chromium and molybdenum

D.none of the above


Answer:Option A

Explanation:


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15. The hardness and tensile strength in austenitic stainless steel can be increased byA.hardening and cold working

B.normalising

C.martempering

D.full annealing


Answer:Option A

Explanation:



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Mechanical Engineering :: EngineeringMaterials


Exercise


"Nothing in life is

to be feared, it is

only to be

understood."- Marie Curie

16. The quenching of steel from the upper critical point results in a fine grained

structure.A.Agree B.Disagree


Answer:Option A

Explanation:



17. An alloy steel which is work hardenable and which is used to make the blades of

bulldozers, bucket wheel excavators and other earth moving equipment contain ironcarbon andA.chromium B.silicon

C.manganese D.magnesium

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Answer:Option C

Explanation:



18. Which of the following has a fine gold colour and is used for imitation jewellery?A.Silicon bronze

B.Aluminium bronze

C.Gun metal

D.Babbit metal


Answer:Option B

Explanation:



19. When the steel is normalised, itsA.yield point increases

B.ductility decreases

C.ultimate tensile strength increases

D.all of these


Answer:Option D

Explanation:

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20. White cast iron has a high tensile strength and a low compressive strength.A.Yes B.No


Answer:Option A

Explanation:



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Materials


Exercise


"Love is like a

war, Easy to

begin Hard to

end."

- (Proverb)

21. Dye penetrant method is generally used to locateA.core defects

B.surface defects

C.superficial defects

D.temporary defects


Answer:Option B

Explanation:



22. The charge is fed into the blast furnace through theA.stack B.throat

C.bosh D.tuyers


Answer:Option B
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Explanation:



23. A small percentage of boron is added to steel in order toA.increase hardenability

B.reduce machinability

C.increase wear resistance

D.increase endurance strength


Answer:Option A

Explanation:



24. Which of the following process of steel making is in operation at Tata Iron and Stee

Works, Jamshedpur?A.Bessemer process

B.Open hearth process

C.Duplex process

D.Electric process


Answer:Option C

Explanation:

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25. The unit cells

A.

contain the smallest number of atoms which when taken together have all the

properties of the crystals of the particular metal

B.have the same orientation and their similar faces are parallel

C.may be defined as the smallest parallelopiped which could be transposed in three

coordinate directions to build up the space lattice

D.all of the above


Answer:Option D

Explanation:



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Engineering Materials - Section 3 Engineering Materials - Section 4 Engineering Materials - Section 5 Engineering Materials - Section 6


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Materials


Exercise


"Forgiveness is a

virtue of thebrave."

- Indira Gandhi

26. Tungsten when added to steel __________ the critical temperature.A.does not effect

B.lowers

C.raises


Answer:Option C

Explanation:



27. Silicon when added to copper improvesA.machinability
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B.hardness

C.hardness and strength

D.strength and ductility


Answer:Option C

Explanation:



28. The alloying element which increases residual magnetism and coercive magnetic

force in steel for magnets isA.chromium B.nickel

C.vanadium D.cobalt


Answer:Option D

Explanation:



29. Cast iron is manufactured inA.blast furnace

B.cupola

C.open hearth furnace

D.bessemer converter

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Answer:Option B

Explanation:



30. The lower critical point for all steels isA.600C B.700C

C.723C D.913C


Answer:Option C

Explanation:



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Materials


Exercise


"Weakness of

attitude becomes

weakness ofcharacter."

- Albert Einstein

31. Haematite iron ore contains iron aboutA.30% B.45%

C.55% D.70%


Answer:Option D

Explanation:



32. The material in which the atoms are arranged regularly in some directions but not in

others, is calledA.amorphous material
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