Mechanical Engineering MCQs

Page No. 31

Neutral solution is one which has pH value__________________?


agreater than 7

✖


bless than 7

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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

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Aluminium bronze contains__________________?


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

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

✖


c10% aluminium and 90% copper

✓


d90% magnesium and 9% aluminium with some copper

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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

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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

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Addition of silicon to aluminium results in____________________?


aimprovement of casting characteristics

✓


bimprovement of corrosion resistance

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cone of the best known age and precipitation-hardening systems

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dimproving machinability

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


adelta metal

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bmonel metal

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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

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bwear resistance is very good

✓


cfatigue strength is not high

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dcreep strength limits its use to fairly low temperatures

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