Mechanical Engineering MCQs

Page No. 40

Cast iron has_________________?


ahigh tensile strength

✖


bits elastic limit close to the ultimate breaking strength

✓


chigh ductility

✖


dall of the above

✖



In mottled cast iron, carbon is available in__________________?


afree form

✖


bcombined form

✖


cnodular form

✖


dpartly in free and partly in combined state

✓



An important property of malleable cast iron in comparison to grey cast iron is the high___________________?


acompressive strength

✖


bductility

✓


ccarbon content

✖


dhardness

✖


View Answer ductility

Carbon steel is_______________?


amade by adding carbon in steel

✖


brefined from cast iron

✖


can alloy of iron and carbon with varying quantities of phosphorus and sulphur

✓


dextensively used for making cutting tools

✖



‘Killed steels’ are those steels__________________?


awhich are destroyed by burning

✖


bwhich after their destruction are recycled to produce fresh steel

✖


cwhich are deoxidised in the ladle with silicon and aluminium

✓


din which carbon is completely burnt

✖



The most effective inhibitor of grain growth, when added in small quantities is__________________?


acarbon

✖


bvanadium

✓


cmanganese

✖


dcobalt

✖


View Answer vanadium

Maximum percentage of carbon in ferrite is___________________?


a0.025%

✓


b0.06%

✖


c0.1%

✖


d0.25%

✖


View Answer 0.025%

Corrosion resistance of steel is increased by addition of________________?


achromium and nickel

✓


bsulphur, phosphorus, lead

✖


cvanadium, aluminium

✖


dtungsten, molybdenum, vanadium, chromium

✖


View Answer chromium and nickel

Railway rails are normally made of_______________?


amild steel

✖


balloy steel

✖


chigh carbon

✓


dtungsten steel

✖


View Answer high carbon

Pick up the wrong statement Nickel and chromium in steel help in _________________?


aproviding corrosion resistance

✖


bimproving machining properties

✓


cproviding high strength at elevated temperatures

✖


draising the elastic limit

✖



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