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Engineering Materials

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

RC 80
RC 65
RC 48
RC 57

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Engineering Materials
Acidic solution is one which has pH value

Less than 7
Greater than 7
Equal to 7
pH value has nothing to do with neutral solution

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Engineering Materials
The machinability of steel is increased by

Phosphorous, lead and sulphur
Phosphorous and aluminium
Sulphur, graphite and aluminium
Silicon and sulphur

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Engineering Materials
Maximum percentage of carbon in austenite is

0.017
0.0026
0.00025
0.008

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

Vanadium
Tin
Zinc
Sulphur

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Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

None of these
Hypereutectic cast irons
Hypoeutectic cast irons
Eutectic cast irons

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