Physical Metallurgy MCQ Questions and Answers

1

A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern due to

A) Dislocation pile-up B) Large number of slip systems C) Low stacking faultenergy D) Dislocation climb

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Answer & Solution

Answer: Option B

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2

Which of the following microstructures of the eutectic is not observed in binary alloys?

A) Lamellar B) Widmanstatten C) Acicular D) Nodular

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Answer & Solution

Answer: Option B

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3

Upon addition of sodium oxide to molten silicate slag, the viscosity of the slag

A) decreases because the oxygen ions supplied by the sodium oxide break the chain structure of the silicate slag B) increases because the oxygen ion supplied by the sodium oxide further add to the oxygen network in the slag C) remains unaffected because fundamentally one can not distinguish between the oxygen ions supplied by the sodium oxide and those already present in the slag D) remains unaffected because the oxygen ions fill up the holes and vacancies present in the liquid slag

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Answer & Solution

Answer: Option A

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4

A 0.4 wt% C steel is austenitised at 900°C for 1 hour and heat treated to get different. inicrostructures. Match the following microstructures to the heat treatments.

P. Martensite + Retained austenite	1. Annealing
Q. Ferrite + fine pearlite	2. Quenching
R. Ferrite + spheroidal cementite	3. Quenching + temperature at 600°C
S. Ferrite + coarse pearlite	4. Normalising

A) P-4, Q-3, R-2, S-1 B) P-1, Q-2, R-3, S-4 C) P-2, Q-4, R-1, S-3 D) P-2, Q-4, R-3, S-1

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Answer & Solution

Answer: Option D

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5

Which of the following has the highest hardness number?

A) Martensite B) Tempered martensite C) Pearlite D) Fine pearlite

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Answer & Solution

Answer: Option A

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6

Assertion: a : During hardening of steel, the component to be heat treated is strongly agitated in the quenching medium.
Reason : r : The agitation breaks down the vapour barrier allowing the quench to proceed at a more rapid rate.

A) Both 'a' and 'r' are correct but 'r' is not correct reason of 'a' B) Both 'a' and 'r' are false C) 'a' is true but 'r' is false D) Both 'a' and 'r' are correct and 'r' is the correct reason for 'a'

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Answer & Solution

Answer: Option B

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7

Stretcher strains found in a low carbon sheet are associated with

A) texture B) dislocation density C) yield point phenomenon D) thickness of the sheet

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Answer & Solution

Answer: Option C

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8

Identify the type of the following invariant reaction:
liquid 1 + solid 1 ⇋ solid 2

A) Eutectic B) Eutectoid C) Peritectic D) Peritectoid

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Answer & Solution

Answer: Option C

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9

With increase in annealing temperature, the following defect density decreases.

A) Vacancy B) Dislocation C) Grain boundary D) All of them

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Answer & Solution

Answer: Option D

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10

The number of Bravais space lattices with two lattice points are

A) 2 B) 3 C) 4 D) 5

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Answer & Solution

Answer: Option D

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Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering