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Engineering Materials

Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Invar
Hastelloy
Silver metal
Duralumin

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

250 VPN
600 VPN
1000 to 1100 VPN
1500 VPN

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Engineering Materials
Cast iron is manufactured in

Open hearth furnace
Cupola
Bessemer converter
Blast furnace

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Engineering Materials
Manganese is added in low carbon steel to

Raise the yield point
All of these
Make the steel ductile and of good bending qualities
Make the steel tougher and harder

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Engineering Materials
The toughness of a material __________ when it is heated.

None of these
Increases
Decreases
Remain same

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Engineering Materials
When low carbon steel is heated up to lower critical temperature

There is no change in grain size
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
The average grain size is a minimum

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