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Engineering Materials

Engineering Materials
The steel widely used for motor car crankshafts is

Silicon steel
Chrome steel
Nickel-chrome steel
Nickel steel

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Engineering Materials
A material is said to be allotropic, if it has

Fixed structure at all temperatures
Atoms distributed in random pattern
Any one of the above
Different crystal structures at different temperatures

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Engineering Materials
The machinability of aluminium increases when _________ is added to aluminium.

Copper
Lead and bismuth
Silicon
Magnesium

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Engineering Materials
Manganese in steel increases its

Fluidity
Hardness
Ductility
Tensile strength

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Engineering Materials
Large forgings, crank shafts, axles normally contain carbon up to

0.55 to 1.0%
0.05 to 0.20%
0.45 to 0.55%
0.20 to 0.45%

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Engineering Materials
Bell metal contains

85 - 92% copper and rest tin with little lead and nickel
70 - 75% copper and rest tin
70% copper and 30% zinc
90% copper and 10% tin

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