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Engineering Materials

Engineering Materials
Induction hardening is basically a

Core hardening process
None of these
Carburising process
Surface hardening process

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Engineering Materials
The machinability of steel is increased by

Sulphur, graphite and aluminium
Phosphorous and aluminium
Silicon and sulphur
Phosphorous, lead and sulphur

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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
Addition of manganese to aluminium results in

Improvement of casting characteristics
Improvement of corrosion resistance
One of the best known age and precipitation hardening systems
Improving machinability

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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.

More than
None of these
Equal to
Less than

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Engineering Materials
Bronze contains

70 - 75% copper and rest tin
70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel
90% copper and 10% tin

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