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Engineering Materials

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

600 VPN
250 VPN
1500 VPN
1000 to 1100 VPN

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Engineering Materials
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Silicon
Phosphorus
Sulphur
Manganese

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Engineering Materials
Delta iron occurs at temperature of

Above melting point
Between 1400°C and 1539°C
Room temperature
Between 910°C and 1400°C

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Engineering Materials
An example of amorphous material is

Glass
Zinc
Silver
Lead

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Engineering Materials
Age-hardening is related with

German silver
Gun metal
Duralumin
Stainless steel

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Engineering Materials
A small percentage of boron is added to steel in order to

Reduce machinability
Increase hardenability
Increase endurance strength
Increase wear resistance

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