Case hardening is not done by

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

A

Cyaniding

B

Sheardising

C

Spherodising

D

None of these

Which is false statement about case hardening? Case hardening is done by

A

Electroplating

B

Cyaniding

C

Induction hardening

D

Nitriding

Quenching is not necessary when hardening is done by

A

Case hardening

B

Flame hardening

C

Nitriding

D

Any one of these

__________ is not a case hardening process.

A

Carburising

B

Nitriding

C

Cyaniding

D

Annealing

Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

A

Increases

B

Decreases

C

Does not affect

D

Exponentially increases

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

A

Flow rate of inlet air

B

Relative humidity of outlet air

C

Humidity of inlet air

D

Temperature of the solid

Hardening of steel is not possible, unless it is heated __________ critical point.

A

Above the highest

B

Above the lowest

C

Between the first & second

D

Between the second & third

Hardening of steel is not possible unless it is heated __________ critical point.

A

Above the highest

B

Above the lowest

C

Between the first & second

D

Between the second & third

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

For hardening alloy steels and high speed steels, they are heated to

A

1100 to 1300°C

B

1300 to 1500°C

C

500 to 600°C

D

700 to 900°C

Case hardening is not done by

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