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Engineering Materials - Interview Questions and Answers

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161. Which is false statement about annealing. Annealing is done to
A. relieve stresses
B. harden steel slightly
C. improve machining characteristic
D. soften material
E. permit further cold working.
Explanation:
162. Slow plastic defoliation of metals under a constant stress is known as
A. creep
B. fatigue
C. endurance
D. plastic deformation
E. non-plastic deformation.
Explanation:
163. Tungsten 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. raises its melting point.
Explanation:
164. Dislocations in materials refer to the following type of defect
A. point defect
B. line defect
C. plane defect
D. volumetric defect
E. chemical defect.
Explanation:
165. Vanadium in high speed steels
A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness.
Explanation:
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