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Engineering Materials

Engineering Materials
Compressive strength of grey cast iron in tonnes/cm is of the order of

57
35
710
1015

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

250 VPN
600 VPN
1500 VPN
1000 to 1100 VPN

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Engineering Materials
Which of the following has a fine gold colour and is used for imitation jewellery?

Gun metal
Silicon bronze
Aluminium bronze
Babbitt metal

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Engineering Materials
Silicon when added to copper improves

Machinability
Strength and ductility
Hardness
Hardness and strength

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Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

None of these
Space lattice
Atomic packing factor
Coordination number

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Engineering Materials
Steel containing ferrite and pearlite is

Hard and tough
Soft
Tough
Hard

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