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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Nitriding
Flame hardening
Case hardening
Any one of these

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Engineering Materials
The elastic stress strain behavior of rubber is

Linear
No fixed relationship
Nonlinear
Plastic

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Engineering Materials
Bell metal contains

70 - 75% copper and rest tin
70% copper and 30% zinc
90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel

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Engineering Materials
Tungsten when added to steel __________ the critical temperature.

Raises
Lowers
Does not effect
None of these

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Engineering Materials
The purpose of heat treatment is to

Modify the structure of the material
Relieve the stresses set up in the material after hot or cold working
Change grain size
Any one of these

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Engineering Materials
Sulphur in steel

Reduces the grain size
Decreases tensile strength and hardness
Acts as deoxidiser
Lowers the toughness and transverse ductility

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