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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

2.5 to 4.5%
5 to 7%
0.012
0.5 to 1%

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

710
57
1015
35

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Engineering Materials
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

Nickel
Cobalt
Chromium
Vanadium

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Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 65
RC 57
RC 80
RC 48

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

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

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Engineering Materials
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

Malleable cast iron
Nodular cast iron
White cast iron
Alloy cast iron

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