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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Flame hardening
Any one of these
Nitriding
Case hardening

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Engineering Materials
In mottled cast iron, carbon is available in

Free form
Nodular form
Partly in free and partly in combined state
Combined form

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Engineering Materials
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

Below recrystallization temperature
910°C
1050°C
770°C

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Engineering Materials
Nodular iron has

High tensile strength
High machinability
All of these
Low melting point

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Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Hastelloy
Duralumin
Invar
Silver metal

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Engineering Materials
Which of the following display properties similar to that of steel?

None of these
Both (A) and (B)
Whiteheart cast iron
Blackheart cast iron

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