Question: In the austempering process of heat treatment, austenite changes into
[A].

martensite

[B].

troostite

[C].

sorbite

[D].

bainite

Answer: Option D

Explanation:

No answer description available for this question.

Question: A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
[A].

normalising

[B].

annealing

[C].

austempering

[D].

martempering

Answer: Option C

Explanation:

No answer description available for this question.

Question: Ferrite and pearlite makes the steel soft and ductile.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: 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 close to the lower critical temperature and then cooled slowly

Answer: Option B

Explanation:

No answer description available for this question.

Question: In spheroidising process, the steel is
[A].

heated below the lower critical temperature and then cooled slowly

[B].

heated upto the lower critical temperature and then cooled in still air

[C].

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

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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 close to the lower critical temperature and then cooled slowly

Answer: Option D

Explanation:

No answer description available for this question.

Question: In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
[A].

in still air

[B].

slowly in the furnace

[C].

suddenly in a suitable cooling medium

[D].

any one of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following statements are true for annealing of steels?
[A].

Steels are heated to 500 to 700° C

[B].

Cooling is done slowly and steadily

[C].

Internal stresses are relieved

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Normalising of steel is done to
[A].

refine the grain structure

[B].

remove strains caused by cold working

[C].

remove dislocations caused in the internal structuure due to hot working

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.