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Engineering Materials

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

RC 65
RC 48
RC 80
RC 57

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Engineering Materials
Cupola produces following material

Cast iron
Wrought iron
Malleable iron
Pig iron

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Engineering Materials
The presence of sulphur in pig iron makes

It hard
It easily machinable
The casting unsound
It brittle

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Engineering Materials
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

None of these
Less than
Equal to
More than

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Engineering Materials
The addition of which of the following improves machining of copper?

Tin
Sulphur
Vanadium
Zinc

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Engineering Materials
Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%
Adding carbon up to 0.83%
Adding carbon up to 2.8%
Adding small quantities of copper

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