Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 58 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

51.

In microscopy, which illumination parameter is used for producing images with dark non-flat structure and bright back ground?

A. Bright field illumination
B. Dark field illumination
C. Both a. and b.
D. None of the above
Answer» B. Dark field illumination
Discussion
52.

In metallography, microscopic method provides information about _____

A. impurities in a metal
B. location and extent of segregation
C. uniformity of structure
D. all of the above
Answer» B. location and extent of segregation
Discussion
53.

In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?

A. 190 °C
B. 210 °C
C. 276 °C
D. None of the above
Answer» C. 276 °C
Discussion
54.

Eutectoid steel contains _____

A. 0.4 % Carbon
B. 0.8 % Carbon
C. 1.2 % Carbon
D. 2.2 % Carbon
Answer» C. 1.2 % Carbon
Discussion
55.

Corrosion fatigue is a combined effect of _____

A. Corrosive environment and mechanical stresses
B. Cyclic loading and corrosion
C. Velocity and mechanical stresses
D. None of the above
Answer» C. Velocity and mechanical stresses
Discussion
56.

Chemical action during corrosion converts metal into metallic component as ________

A. hydroxide
B. oxide
C. sulphate
D. all of the above
Answer» E.
Discussion
57.

Austenite phase in Iron-Carbon equilibrium diagram _______

A. is face centered cubic structure
B. has magnetic phase
C. exists below 727 °C
D. all of the above
Answer» B. has magnetic phase
Discussion
58.

At room temperature, hardness of precipitation hardening alloys ______

A. increases with time
B. decreases with time
C. remains constant
D. none of the above
Answer» B. decreases with time
Discussion