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Engineering Materials

Engineering Materials
Solder is an alloy consisting of

Tin, antimony, copper
Lead and zinc
Tin and lead
Tin and copper

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Engineering Materials
Chromium when added to steel _________ the tensile strength.

Does not effect
None of these
Decreases
Increases

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Engineering Materials
Nickel when added to copper improves

Strength and ductility
Machinability
Hardness and strength
Hardness

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Engineering Materials
Bronze contains

90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel
70 - 75% copper and rest tin
70% copper and 30% zinc

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Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

None of these
Coordination number
Space lattice
Atomic packing factor

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Engineering Materials
Hardness of martensite is about

RC 48
RC 80
RC 65
RC 57

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