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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 80
RC 65
RC 48
RC 57

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Engineering Materials
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.6 to 0.8%
0.4 to 0.6%
0.35 to 0.45%
0.0004

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Engineering Materials
Which is false statement about tempering? Tempering is done to

Improve toughness
Release stresses
Improve machinability
Improve ductility

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Engineering Materials
Iron is

Paramagnetic
Dielectric
Ferromagnetic
Ferroelectric

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Engineering Materials
Which of the following constituents of steels is softest and least strong?

Cementite
Austenite
Pearlite
Ferrite

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Engineering Materials
Closed packed hexagonal space lattice is found in

None of these
Alpha-iron, tungsten, chromium and molybdenum
Gamma-iron, aluminium, copper, lead, silver and nickel
Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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