Mechanical Engineering MCQs

Page No. 43

Vanadium in high speed steels__________________?


apromotes decarburisation

✖


bprovides high hot hardness

✖


cforms very hard carbides and thus in-creases wear resistance

✓


dpromotes retention of austenite

✖



Hardness of lower bainite (tempered martensite) is about________________?


aRC 65

✖


bRC 48

✖


cRC 57

✓


dRC 80

✖


View Answer RC 57

Which is false statement about annealing. Annealing is done to________________?


arelieve stresses

✖


bharden steel slightly

✓


cimprove machining characteristic

✖


dsoften material

✖


View Answer harden steel slightly

Carbon in iron is an example of__________________?


asubstitutional solution

✖


binterstitial solid solution

✓


cintermetallic compounds

✖


dall of the above

✖



Materials after cold working are subjected to following process to relieve stresses__________________?


ahot working

✖


btempering

✖


cnormalising

✖


dannealing

✓


View Answer annealing

Hardness of martensite is about___________________?


aRC 65

✓


bRC 48

✖


cRC 57

✖


dRC 80

✖


View Answer RC 65

Process of austempering results in__________________?


aformation of bainite structure

✓


bcarburised structure

✖


cmartenistic structure

✖


dlamellar layers of carbide distributed throughout the structure

✖



Induction hardening is the process of_____________________?


ahardening surface of workpiece to ob-tain hard and wear resistant surface

✓


bheating and cooling rapidly

✖


cincreasing hardness throughout

✖


dinducing hardness by continuous process

✖



Solder is an alloy consisting of________________?


atin, antimony, copper

✖


btin and copper

✓


ctin and lead

✖


dlead and zinc

✖


View Answer tin and copper

Inconel is an alloy of___________________?


anickel, chromium and iron

✓


bnickel, copper

✖


cnickel, chromium

✖


dnickel, zinc

✖



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