Explore topic-wise MCQs in Mechanical Metallurgy.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.

1.

In the ductile material the necking begins, at the point where ________________

A. increased strain hardening cross the yield point
B. increased strain hardening fails to compensate for the decrease in the cross-section area
C. the decrease cross-sectional area reaches half the initial cross-sectional area
D. the decrease cross-sectional area reaches one-fourth of the initial cross-sectional area
Answer» C. the decrease cross-sectional area reaches half the initial cross-sectional area
2.

Rupture is a type of _________

A. ductile fracture
B. brittle fracture
C. fatigue fracture
D. creep fracture
Answer» B. brittle fracture
3.

The necking is phenomena observed in ___________

A. ductile fracture
B. brittle fracture
C. fatigue fracture
D. creep fracture
Answer» B. brittle fracture
4.

If the surface energy is high then _____________ is not likely to happen.

A. brittle fracture
B. ductile fracture
C. fatigue fracture
D. pure shear fracture
Answer» B. ductile fracture
5.

As the grain size decreases, the ductile to brittle transition temperature _________

A. increases
B. decreases
C. remains the same
D. no defined relationship between them
Answer» C. remains the same
6.

The ductile to brittle transition does not depend on the metallurgical feature. It is material-specific property.

A. True
B. False
Answer» C.
7.

Which of the following equation depicts the Cottrell formulation of ductile to brittle transition?

A. ( <sub>i</sub>D<sup>1/2</sup>+k )k = G <sub>s</sub>
B. ( <sub>i</sub>D<sup>1/2</sup>+k )k &gt; G <sub>s</sub>
C. ( <sub>i</sub>D<sup>1/2</sup>+k )k &lt; G <sub>s</sub>
D. ( <sub>i</sub>D<sup>1/2</sup>+k ) = G <sub>s</sub>
Answer» C. ( <sub>i</sub>D<sup>1/2</sup>+k )k &lt; G <sub>s</sub>
8.

The grain size has an effect on the ductile or brittle failure of material.

A. True
B. False
Answer» B. False
9.

Which of the following force is responsible for forcing dislocation together during cracking?

A. Tensile force
B. Shear force
C. Bending force
D. Torsional force
Answer» C. Bending force
10.

The form of microcrack nucleation equation is_________

A. ( <sub>s</sub>- <sub>i</sub>)nb = 2 <sub>s</sub>
B. ( <sub>s</sub>- <sub>i</sub>)nb = 3 <sub>s</sub>
C. ( <sub>s</sub>- <sub>i</sub>)nb = 4 <sub>s</sub>
D. ( <sub>s</sub>- <sub>i</sub>)nb = 8 <sub>s</sub>
Answer» B. ( <sub>s</sub>- <sub>i</sub>)nb = 3 <sub>s</sub>