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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Any one of these
Nitriding
Case hardening
Flame hardening

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Engineering Materials
Heavy duty leaf and coil springs contain carbon of the following order

0.002
0.008
0.005
0.01

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where there is no further flow of metal
The points where no further change occurs
The points of discontinuity
Constant for all metals

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Engineering Materials
German silver is an alloy of

Nickel, Copper and zinc
Silver and some impurities
Refined silver
Nickel and copper

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Engineering Materials
The alloying element which reduces the formation of iron sulphide in steel is

Manganese
Chromium
Vanadium
Nickel

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Engineering Materials
High carbon steel carries carbon percentage

0.1 to 0.3%
0.6 to 0.8%
0.8 to 1.5%
0.3 to 0.6%

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