Mechanical Engineering MCQs

Page No. 36

Balls for ball bearings are made of_________________?


acast iron


bmild steel


cstainless steel


dcarbon-chrome steel


View Answer carbon-chrome steel

Which is the false statement about wrought iron. It has________________?


ahigh resistance to rusting and corrosion


bhigh ductility


cability of hold protective coating


duniform strength in all directions



Taps, dies and drills contain carbon________________?


abelow 0.5%


bbelow 1%


cabove 1%


dabove 2.2%


View Answer above 1%

Large forgings, crank shafts, axles normally contain carbon up to________________?


a0.05 to 0.20%


b0.20 to 0.45%


c0.45 to 0.55%


d0.55 to 1.0%


View Answer 0.45 to 0.55%

Cold rolled steel sheets contain carbon of the following order___________________?


a0.1%


b0.2%


c0.4%


d0.6%


View Answer 0.1%

Which of the following element results in presence of free graphite in C.I_________________?


acarbon


bsulphur


csilicon


dmanganese


View Answer silicon

The machinability of steel is increased by___________________?


asilicon and sulphur


bphosphorous, lead and sulphur


csulphur, graphite and aluminium


dphosphorous and aluminium



Blast furnace produces following by reduction of iron ore_______________?


acast iron


bpig iron


cwrought iron


dmalleable iron


View Answer pig iron

Melting point of iron is__________________?


a1539°C


b1601°C


c1489°C


d1712°C


View Answer 1539°C

Which of the following elements does not impart hardness to steel__________________?


acopper


bchromium


cnickel


dsilicon


View Answer copper

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