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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

5 to 7%
0.5 to 1%
2.5 to 4.5%
0.012

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Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron
Copper, nickel and antimony
Iron, zinc and bismuth
Nickel, copper and zinc

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Engineering Materials
The ability of a material to resist softening at high temperature is known as

Creep
Fatigue
Hot tempering
Hot hardness

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Engineering Materials
Beryllium bronze contains

60% copper and 40% beryllium
80% copper and 20% beryllium
99% copper and 1% beryllium
97.75% copper and 2.25% beryllium

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Engineering Materials
The molecules in a solid move

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

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Engineering Materials
White cast iron has

Carbon in the form of carbide
All of these
High compressive strength
Low tensile strength

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