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Engineering Materials

Engineering Materials
Nodular cast iron is produced by adding ________ to the molten cast iron.

Copper
Nickel
Magnesium
Chromium

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Engineering Materials
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Less than
More than
Equal to
None of these

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Engineering Materials
When low carbon steel is heated up to upper critical temperature

There is no change in grain size
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
The average grain size is a minimum

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Engineering Materials
A material is said to be allotropic, if it has

Different crystal structures at different temperatures
Fixed structure at all temperatures
Atoms distributed in random pattern
Any one of the above

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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.

None of these
Cementite
Both A and B
Free graphite

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Engineering Materials
The elastic stress strain behavior of rubber is

Plastic
Nonlinear
No fixed relationship
Linear

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