Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.

Eutectoid reaction occurs at

A

600°C

B

727°C

C

1147°C

D

1493°C

Eutectoid composition of carbon steel at room temperature is

A

Cementite

B

Pearlite

C

Martensite

D

Ferrite

Steel with __________ carbon is known as hypo-eutectoid steel.

A

0.8%

B

Below 0.8%

C

Above 0.8%

D

None of these

In process annealing, the hypo eutectoid steel is

A

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

B

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

C

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

D

Heated below or closes to the lower critical temperature and then cooled slowly

In a hardening process, the hypo-eutectoid steel is

A

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

B

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

C

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

D

Heated below or closes to the lower critical temperature and then cooled slowly

An eutectoid steel consists of

A

Wholly pearlite

B

Wholly austenite

C

Pearlite and ferrite

D

Pearlite and cementite

Eutectoid steel contains following percentage of carbon

A

0.02%

B

0.3%

C

0.63%

D

0.8%

Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

A

723

B

959

C

1147

D

1493

A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.

A

Less than

B

Equal to

C

More than

D

Equal to or more than

A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.

A

Less than

B

Equal to

C

More than

D

Equal to or more than

Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.

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