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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