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ENGINEERING MATERIALS

Engineering Materials
Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Alpha-iron, tungsten, chromium and molybdenum
None of these
Gamma-iron, aluminium, copper, lead, silver and nickel

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Engineering Materials
Body centered cubic space lattice is found in

None of these
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Gamma iron, aluminium, copper, lead, silver and nickel
Alpha iron, tungsten, chromium and molybdenum

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Engineering Materials
A material is said to be allotropic, if it has

Any one of the above
Different crystal structures at different temperatures
Atoms distributed in random pattern
Fixed structure at all temperatures

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Engineering Materials
The surface hardness of the following order is achieved by nitriding operation

600 VPN
250 VPN
1500 VPN
1000 to 1100 VPN

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Engineering Materials
Slow plastic deformation of metals under a constant stress is known as

Fatigue
Endurance
Creep
Plastic deformation

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