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Engineering Materials

Engineering Materials
Which is false statement about case hardening? Case hardening is done by

Nitriding
Induction hardening
Electroplating
Cyaniding

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Engineering Materials
The machinability of steel is improved by adding

Nickel and chromium
Nickel
Chromium
Sulphur, lead and phosphorus

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Engineering Materials
Which of the following property is desirable for materials used in tools and machines?

Ductility
Malleability
Plasticity
Elasticity

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Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Heat treatment
Recrystallization
Allotropic change
Precipitation

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Engineering Materials
Closed packed hexagonal space lattice is found in

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

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Engineering Materials
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

Cementite
Free graphite
Both A and B
None of these

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