Physical Metallurgy MCQ Questions and Answers

11

The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.

A) silicon B) carbon C) phosphorous D) chromium

Discuss

Answer & Solution

Answer: Option B

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

12

Assertion 'a': Hardenability of steel can be increased by adding certain alloying elements.
Reason 'r': The alloying elements can provide a fine dispersion of alloy carbides

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

Discuss

Answer & Solution

Answer: Option A

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

13

A copper sample has been metallographically analysed for determining its mean grain size. It is found to have an ASTM grain size number of 5. The number of grains per mm² in the sample will be

A) 72 B) 124 C) 248 D) 496

Discuss

Answer & Solution

Answer: Option C

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

14

The energetic driving force for grain growth is due to

A) dislocations in the matrix B) grain boundary energy C) residual strains in different grains D) stacking fault energy

Discuss

Answer & Solution

Answer: Option B

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

15

Match the following fracture surface features listed in Group I with the fracture mechanisms listed in Group II.

Group I	Group II
P. Striations	1. Intergranular fracture
Q. Dimples and microvoids	2. Cleavage fracture
R. Flat facets and "river markings"	3. Ductile fracture
S. Jagged surface with grain-like features	4. Fatigue fracture

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

Discuss

Answer & Solution

Answer: Option C

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

16

According to Hume Rothery's rules, size of atoms must not differ by more than

A) 0.05 B) 0.15 C) 0.35 D) 0.55

Discuss

Answer & Solution

Answer: Option B

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

17

in a typical Ellingham diagram for the oxides, the C + O₂ = CO₂ line is nearly horizontal because

A) The slope of the line is equal to the enthalpy change at standard state, which is approximately zero is this case B) The slope of the line is equal to the entropy change at standard state, which is approximately zero in the case C) CO₂ shows non-ideal behaviour D) CO₂ is a gaseous oxide

Discuss

Answer & Solution

Answer: Option B

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

18

Match the following.

Group-I	Group-II
P. Hot shortness	1. Overcome by adding excessive amount of manganese
Q. Cold shortness	2. Weld decay
R. Season cracking	3. Reduction in impact strength at low temperatures
S. Sensitization	4. Tendency of brasses to corrode due to high residual stress

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

Discuss

Answer & Solution

Answer: Option A

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

19

Hardenability of steel does not depend upon the

A) alloy content B) grain size C) amount of carbon present D) amount of cold work

Discuss

Answer & Solution

Answer: Option D

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

20

The interlamellar spacing, S, and the undercooling, ΔT below the eutectoid temperature in plane carbon steels are related as

A) SαΔT B) SαΔT² C) SαΔT^-1 D) $$S\alpha \Delta {T^{ - \frac{1}{2}}}$$

Discuss

Answer & Solution

Answer: Option C

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

Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering