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Engineering Materials - Interview Questions and Answers

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156. Argentite is the principal ore or raw material for
A. aluminium
B. tin
C. zinc
D. lead
E. silver.
Explanation:
157. Chromium in steel
A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. makes steel hard.
Explanation:
158. Which is false statement about tempering. Tempering is done to
A. improve machinability
B. improve ductility
C. improve toughness
D. release stresses
E. reduce hardness and brittleness.
Explanation:
159. Hardness of upper bainite (acicular structure) is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32.
Explanation:
160. Materials after cold working are subjected to following process to relieve stresses
A. hot working
B. tempering
C. normalising
D. annealing
E. special heat treatment.
Explanation:
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