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Engineering Materials

Engineering Materials
Compressive strength of grey cast iron in tonnes/cm is of the order of

1015
710
57
35

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

Magnesium
Lead and bismuth
Silicon
Copper

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Engineering Materials
In mottled cast iron, carbon is available in

Nodular form
Partly in free and partly in combined state
Free form
Combined form

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Engineering Materials
Beryllium bronze contains

99% copper and 1% beryllium
97.75% copper and 2.25% beryllium
60% copper and 40% beryllium
80% copper and 20% beryllium

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Engineering Materials
The silicon steel is widely used for

Motor car crankshafts
Connecting rods
Cutting tools
Generators and transformers in the form of laminated cores

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Engineering Materials
Bell metal contains

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

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