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Engineering Materials

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

Hot tempering
Creep
Hot hardness
Fatigue

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Engineering Materials
Silicon when added to copper improves

Machinability
Hardness
Hardness and strength
Strength and ductility

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Engineering Materials
Bell metal contains

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

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Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron, beta iron and gamma iron
Body centered cubic iron and face centered cubic iron
Alpha iron, gamma from and delta iron
Alpha iron and beta iron

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Engineering Materials
Free cutting steels

Require minimum cutting force
Contain carbon in free from
Is used where rapid machining is the prime requirement
Can be cut freely

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Engineering Materials
Maximum percentage of carbon in austenite is

0.008
0.00025
0.017
0.0026

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MORE MCQ ON Engineering Materials

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