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ENGINEERING MATERIALS

Engineering Materials
Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
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

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

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

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

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

1500 VPN
1000 to 1100 VPN
600 VPN
250 VPN

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

Creep
Plastic deformation
Fatigue
Endurance

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