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Engineering Materials

Engineering Materials
Maximum percentage of carbon in austenite is

0.0026
0.017
0.008
0.00025

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

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

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Engineering Materials
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Phosphorus
Silicon
Manganese
Sulphur

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Engineering Materials
In mottled cast iron, carbon is available in

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

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Engineering Materials
Pearlite consists of

13% ferrite and 87% cementite
13% cementite and 87% ferrite
13% carbon and 87% ferrite
6.67% carbon and 93.33% iron

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

57
1015
710
35

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