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Engineering Materials

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

Nitriding
Induction hardening
Cyaniding
Electroplating

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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
Both A and B
Free graphite
None of these

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Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 65
RC 48
RC 80
RC 57

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Engineering Materials
Manganese in steel increases its

Tensile strength
Fluidity
Hardness
Ductility

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Engineering Materials
The purpose of heat treatment is to

Any one of these
Change grain size
Relieve the stresses set up in the material after hot or cold working
Modify the structure of the material

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

Chromium
Copper
Nickel
Silicon

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