Mechanical Engineering MCQs

Page No. 31

Neutral solution is one which has pH value__________________?


agreater than 7


bless than 7


cequal to 7


dpH value has nothing to do with neutral solution


View Answer equal to 7

The correct composition of Babbit metal is__________________?


a87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi


b90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg


c87% Sn, 4% Cu, 8% Sb, 1% Al


d82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg



Aluminium bronze contains__________________?


a94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe


b92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg


c10% aluminium and 90% copper


d90% magnesium and 9% aluminium with some copper



Foundry crucible is made of_________________?


amild steel


bgerman silver


clead


dgraphite


View Answer graphite

Which of the following has highest specific strength of all structural materials__________________?


amagnesium alloys


btitanium alloys


cchromium alloys


dmagnetic steel alloys


View Answer titanium alloys

White metal contains__________________?


a63 to 67% nickel and 30% copper


b88% copper and 10% tin and rest zinc


calloy of tin, lead and cadmium


dsilver and chromium



Addition of silicon to aluminium results in____________________?


aimprovement of casting characteristics


bimprovement of corrosion resistance


cone of the best known age and precipitation-hardening systems


dimproving machinability



Which of the following alloys does not have copper as one of the constituents________________?


adelta metal


bmonel metal


cconstantan


dnichrome


View Answer nichrome

Addition of manganese to aluminium results in__________________?


aimprovement of casting characteristics


bimprovement of corrosion resistance


cone of the best known age and precipitation-hardening systems


dimproving machinability



Which is false statement about properties of aluminium ___________________?


amodulus of elasticity is fairly low


bwear resistance is very good


cfatigue strength is not high


dcreep strength limits its use to fairly low temperatures



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