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ENGINEERING MATERIALS

Engineering Materials
Closed packed hexagonal space lattice is found in

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

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Engineering Materials
Body centered cubic space lattice is found in

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

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

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

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

1500 VPN
1000 to 1100 VPN
250 VPN
600 VPN

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

Endurance
Plastic deformation
Creep
Fatigue

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