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Engineering Materials

Engineering Materials
Which of the following is an amorphous material?

Glass
Lead
Mica
Silver

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Engineering Materials
Which of the following has highest specific strength of all structural materials?

Chromium alloys
Magnesium alloys
Magnetic steel alloys
Titanium alloys

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Engineering Materials
Which of the following elements does not impart hardness to steel?

Chromium
Silicon
Nickel
Copper

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Engineering Materials
Gun metal contains

85 - 92% copper and rest tin with little lead and nickel
70 - 78% copper and rest tin
90% copper and 10% tin
70% copper and 30% zinc

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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
Hardness of martensite is about

RC 57
RC 80
RC 65
RC 48

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