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Engineering Materials

Engineering Materials
The transistor is made of

Germanium
Silver
Copper
Gold

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Engineering Materials
Which of the following material has nearly zero coefficient of expansion?

Stainless steel
Heat resisting steel
High speed steel
Invar

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

Gun metal
Aluminium bronze
Babbitt metal
Silicon bronze

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Engineering Materials
In high speed steels, manganese is used to tougher the metal and to increase its

Critical temperature
Yield point
Melting point
Hardness

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Engineering Materials
Hematite iron ore contains iron about

0.3
0.7
0.55
0.45

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

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

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