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Engineering Materials

Engineering Materials
Which of the following material has maximum ductility?

Aluminium
Nickel
Copper
Mild steel

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

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

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Engineering Materials
A material is known as allotropic or polymorphic if it

Responds to heat treatment
Has a fixed structure under all conditions
Exists in several crystal forms at different temperatures
Has its atoms distributed in a random pattern

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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

Allotropic change
Precipitation
Heat treatment
Recrystallization

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Engineering Materials
Super conduction by metals is observed in the temperature range of

Around 100°C
Around 0°C
Below 10°K
Above 100°K

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Engineering Materials
Recrystallization temperature can be lowered by

All of these
Working at lower temperature
Purification of metal
Grain refinement

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