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Engineering Materials - Interview Questions and Answers

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166. Manganese in steel increases its
A. tensile strength
B. hardness
C. ductility
D. fluidity
E. malleability.
Explanation:
167. Hardness of martensite is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32.
Explanation:
168. Which is false statement about case hardening. Case hardening is done by
A. electroplating
B. cyaniding
C. induction hardening
D. nitriding
E. flame hardening.
Explanation:
169. Amorphous material is one
A. in which atoms align themselves in a geometric pattern upon solidification
B. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. which is not attacked by phosphorous
D. which emits fumes on melting
E. none of the above.
Explanation:
170. The surface hardness of the following order is achieved by nit riding operation
A. 600 VPN
B. 1500 VPN
C. 1000 to 1100 VPN
D. 250 VPN
E. 2000 VPN.
Explanation:
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