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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Any one of these
Flame hardening
Nitriding
Case hardening

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

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

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Engineering Materials
Hematite iron ore contains iron about

0.7
0.45
0.55
0.3

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Engineering Materials
Balls for ball bearings are made of

Stainless steel
Mild steel
Carbon-chrome steel
Cast iron

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Manganese
Sulphur
Phosphorus
Silicon

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Engineering Materials
The compressive strength of cast iron is __________that of its tensile strength.

None of these
More than
Less than
Equal to

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