Mechanical Engineering Questions And Answers :: Engineering Materials: part4

Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 6 to 10

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

6.Materials after cold working are subjected to following process to relieve stresses

hot working
special heat treatment.

7.Which is false statement about annealing. Annealing is done to

relieve stresses
harden steel slightly
improve machining characteristic
soften material
permit further cold working.

8.Tungsten in steel

improves wear resistance, cutting ability and toughness
refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
improves cutting ability and reduces hardenability
gives ductility, toughness, tensile strength and anticorrosion properties
raises its melting point.

9.Dislocations in materials refer to the following type of defect

point defect
line defect
plane defect
volumetric defect
chemical defect.

10.Vanadium in high speed steels

promotes decarburisation
provides high hot hardness
forms very hard carbides and thus in-creases wear resistance
promotes retention of austenite
increases toughness.

More Engineering Materials QUESTIONS AND ANSWERS available in next pages

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