Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Engineering Materials
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

More than

Equal to

Less than

None of these

More than

Equal to

Less than

None of these

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Engineering Materials
Ferromagnetic alpha iron exists in temperature range of

910 to 1440°C

1400 to 1539°C

770 to 910°C

Below 723°C

910 to 1440°C

1400 to 1539°C

770 to 910°C

Below 723°C

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Engineering Materials
White cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by annealing process. It is soft, tough and easily machined metal

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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Engineering Materials
The machinability of aluminium increases when _________ is added to aluminium.

Silicon

Magnesium

Lead and bismuth

Copper

Silicon

Magnesium

Lead and bismuth

Copper

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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated up to the lower critical temperature and then cooled in still air

None of these

Heated below the lower critical temperature and then cooled slowly

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated up to the lower critical temperature and then cooled in still air

None of these

Heated below the lower critical temperature and then cooled slowly

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Engineering Materials
Tungsten when added to steel __________ the critical temperature.

Raises

Lowers

None of these

Does not effect

Raises

Lowers

None of these

Does not effect

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Engineering Materials

Engineering Materials Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Engineering Materials Ferromagnetic alpha iron exists in temperature range of

Engineering Materials White cast iron

Engineering Materials The machinability of aluminium increases when _________ is added to aluminium.

Engineering Materials In spheroidising process, the steel is

Engineering Materials Tungsten when added to steel __________ the critical temperature.

Engineering Materials
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Engineering Materials
Ferromagnetic alpha iron exists in temperature range of

Engineering Materials
White cast iron

Engineering Materials
The machinability of aluminium increases when _________ is added to aluminium.

Engineering Materials
In spheroidising process, the steel is

Engineering Materials
Tungsten when added to steel __________ the critical temperature.