Mechanical Metallurgy MCQ Questions and Answers

41

In fracture toughness characterised by K_IC or J_IC, I in the subscript indicates loading by

A) cracj opening mode B) forward shear mode C) parallel shear mode D) perpendicular shear mode

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Answer & Solution

Answer: Option A

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42

Springback in sheet metal bending depends upon

A) elastic limit B) bend radius C) degree of bend D) thickness of sheet

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Answer & Solution

Answer: Option B

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43

Match the following failure/fracture observations in Group 1 with the likely deformation/process in Group 2.

Group 1	Group 2
P. Cup and cone	1. Creep failure
Q. Beach marks	2. Brittle failure
R. Clevage	3. Normal ductile failure
S. Triple point cracking	4. Completely ductile failure
	5. Fatigue failure

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

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Answer & Solution

Answer: Option B

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44

The pressure required to maintain flow during indirect extrusion
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio

A) P, Q B) Q, R C) R, S D) P, S

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Answer & Solution

Answer: Option A

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45

The typical dislocation density (lines/cm²) of a hot rolled material is

A) 10² B) 10¹² C) 10⁶ D) 10⁹

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Answer & Solution

Answer: Option B

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46

Amongst the following equipments, the productivity is the maximum for

A) gravity hammer B) hydraulic press C) mechanical press D) screw press

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Answer & Solution

Answer: Option B

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47

Match the loading conditions in Group 1 with the characteristics in Group 2.

Group 1	Group 2
P. Tensile	1. Barelling
Q. Compressive	2. Intergrannular cracking
R. Fatigue	3. Striations
S. Creep	4. Cup and cone
	5. Earing

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

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Answer & Solution

Answer: Option B

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48

Extrusion pressure is proportional to

A) fractional reduction in area (r) B) extrusion ratio (R) C) natural logarithm of r D) natural logarithm of R

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Answer & Solution

Answer: Option D

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49

A 480 mm thick slab is hot-rolled using a roll of 720 mm diameter. For a coefficient of friction of 0.5, the maximum possible reduction (in mm) is

A) 90 B) 180 C) 240 D) 360

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Answer & Solution

Answer: Option A

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50

Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.

A) a is false but r is true B) a is true and r is also true, but r is not the reason for a C) a is true and r is also true, and r is the reason for a D) a is true but r is false

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Answer & Solution

Answer: Option C

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Mechanical Metallurgy MCQ Questions and Answers | Metallurgical Engineering