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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 80
RC 57
RC 48
RC 65

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Engineering Materials
Taps dies and drills contain carbon

Below 0.5%
Below 1%
Above 1%
Above 2.2%

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Engineering Materials
German silver is an alloy of

Nickel, Copper and zinc
Nickel and copper
Refined silver
Silver and some impurities

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Engineering Materials
Blast furnace produces following by reduction of iron ore

Pig iron
Malleable iron
Wrought iron
Cast iron

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Engineering Materials
The molecules in a solid move

In a random manner
In circular motion
Back and forth like tiny pendulums
In a haphazard way

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Engineering Materials
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

More than
Equal to
Less than
None of these

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