Physical Metallurgy MCQ Questions and Answers

1

Match the phases of steel in Group I with the crystal structures in Group II.

Group I	Group II
P. Martensite	1. bcc
Q. Cementite	2. fcc
R. Austenite	3. bct
S. Ferrite	4. Orthorhombic

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

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

2

When the radius of tiny particle is less than critical nucleous size then it is called

A) embryo B) Nuclei C) embryo and Nuclei D) growth

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

3

Movement of jogs can produce

A) vacancies B) interstitial C) grain boundary sliding D) grain boundary migration

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

4

Four eutectoid steel samples W, X, Y and Z are austenitized and then subjected to normalising, quenching, martempering and austempering treatments respectively. Which of the following statements is not correct?

A) The microstructure of sample W will be fully pearlitic B) The microstructure of sample X will be untempered martensite C) The microstructure of sample Y will be teinpered martensite D) The microstructure of sample Z will be bainitic

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

5

Secondary hardening in steels arises out of the

A) precipitation of fine alloy carbides at high temperature B) refinement of ferrite grain size by working C) decomposition of retained austenite upon heat treatment D) precipitation of complex inter-metallics upon heat treatment

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

6

Match the materials in Group 1 with the possible microstructure adjacent to the fusion line in the heat affected zone, in Group 2.

Group 1	Group 2
P. Pure aluminium	1. Martensite
Q. 0.6 mass% carbon steel	2. Grain boundary precipitation
R. Aged AI 4.5 mass% Cu alloy	3. Coarse precipitates
S. 18/8 stainless steel	4. Bainite
	5. Coherent precipitates
	6. Twins
	7. Grain growth

A) P-6, Q-1, R-5, S-2 B) P-7, Q-1, R-2, S-4 C) P-4, Q-3, R-2, S-6 D) P-7, Q-1, R-3, S-2

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

7

Tetragonal crystal structure has

A) a = b = c and α = β = γ = 90° B) a = b ≠ c and α = β = γ = 90° C) a ≠ b ≠ c and α = β = γ = 90° D) a = b = c and α = β = γ ≠ 90°

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

8

The percentage of pearlite in 0.8% carbon steel

A) 100 B) 89 C) 11 D) 50

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

9

Eutectic AI-Sialloys can be modified by small additions of

A) Na B) Mg C) B D) Cr E) Cu

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

10

A peritectic reaction is

A) α + β ⟶ γ B) L + α ⟶ β C) L₁ + L₂ ⟶ β D) L + α + β ⟶ γ

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering