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Engineering Materials

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

1015
57
35
710

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Engineering Materials
A material is known as allotropic or polymorphic if it

Has a fixed structure under all conditions
Responds to heat treatment
Exists in several crystal forms at different temperatures
Has its atoms distributed in a random pattern

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Engineering Materials
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

Monel metal
Nichrome
Babbitt metal
Phosphor bronze

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Engineering Materials
When low carbon steel is heated up to lower critical temperature

There is no change in grain size
The average grain size is a minimum
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly

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Engineering Materials
Cold rolled steel sheets contain carbon of the following order

0.006
0.004
0.002
0.001

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Engineering Materials
The hardness is the property of a material due to which it

Can be drawn into wires
Can be rolled or hammered into thin sheets
Can cut another metal
Breaks with little permanent distortion

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