Mechanical Engineering MCQs

Page No. 37

Nodular iron has____________________?


ahigh maehinability


blow melting point


chigh tensile strength


dall of the above


View Answer all of the above

The hardness of steel increases if it contains____________________?


aaustenite


bmartensite


cpearlite


dcementite


View Answer martensite

Cobalt in steel __________________?


aimproves wear resistance, cuttinability and toughness


brefines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties


cimproves cutting ability and reduce hardenability


dgives ductility, toughness, tensile strength and anti corrosion property:



Tensile strength of steel can be safely in-creased by________________?


aadding carbon up to 2.8%


badding carbon up to 6.3%


cadding carbon up to 0.83%


dadding small quantities of copper



Connecting rod is usually made of_________________?


aaluminium


blow carbon steel


cmedium carbon steel


dhigh carbon steel


View Answer medium carbon steel

Tungsten in high speed steel provides________________?


ahot hardness


btoughness


cwear resistance


dsharp cutting edge


View Answer hot hardness

Sulphur in steel________________?


aacts as deoxidiser


breduces the grain size


cdecreases tensile strength and hardness


dlowers the toughness and transverse ductility



The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?


adecrease


bincrease


cremain constant


dfirst increase and then decrease


View Answer increase

Ductility of a material can be defined as__________________?


aability to undergo large permanent deformations in compression


bability to recover its original form


cability to undergo large permanent deformations in tension


dall of the above



In compression, a prism of brittle material will break________________?


aby forming a bulge (l>) by shearing along oblique plane


bin direction perpendicular to application of load


cby crushing into thousands of pieces


dnone of the above



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