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Engineering Materials

Engineering Materials
Nodular cast iron is produced by adding ________ to the molten cast iron.

Chromium
Copper
Nickel
Magnesium

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Engineering Materials
The machinability of steel is improved by adding

Nickel and chromium
Sulphur, lead and phosphorus
Nickel
Chromium

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Engineering Materials
There are fourteen atoms in a unit cell of

Body centered cubic space lattice
Close packed hexagonal space lattice
None of these
Face centered cubic space lattice

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

250 VPN
1500 VPN
1000 to 1100 VPN
600 VPN

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Engineering Materials
Steel containing ferrite and pearlite is

Hard and tough
Hard
Soft
Tough

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Phosphorus
Manganese
Silicon
Sulphur

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