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Engineering Materials

Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 48
RC 65
RC 57
RC 80

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Engineering Materials
Wrought iron

All of these
Cannot stand sudden and excessive shocks
Is a ductile material
Can be easily forged or welded

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Engineering Materials
Which is false statement about tempering? Tempering is done to

Release stresses
Improve toughness
Improve machinability
Improve ductility

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Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 10 : 20
30 : 20 : 30 : 20
40 : 30 : 20 : 10
50 : 20 : 20 : 10

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Engineering Materials
In nodular iron, graphite is in the form of

Spheroids
Free carbon
Cementite
Flakes

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Engineering Materials
The metal suitable for bearings subjected to heavy loads, is

Monel metal
Phosphor bronze
Silicon bronze
White metal

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