Material Science And Metallurgy (3131904) MCQs

MCQs of Heat Treatment of Steel

Showing 31 to 30 out of 40 Questions
1 2 3 4
31.

The toughness in a steel is increased and brittleness is decreased by a heat treatment operation called

(a)

Annealing
(b)

Normalizing
(c)

Tempering
(d)

Case hardening
Answer:

Option (c)

32.

Induction hardening is basically a

(a)

carburising process
(b)

Normalizing
(c)

Tempering
(d)

Case hardening
Answer:

Option (c)

33.

Induction hardening is basically a

(a)

carburising process
(b)

surface hardening process
(c)

core-hardening process
(d)

none of these
Answer:

Option (b)

34.

In induction hardening __________ is high.

(a)

current 
(b)

voltage
(c)

frequency
(d)

temperature
Answer:

Option (c)

35.

The machine tool guide ways are usually hardened by

(a)

vacuum hardening
(b)

martempering
(c)

induction hardening
(d)

flame hardening
Answer:

Option (d)

36.

Quenching is not necessary when hardening is done by

(a)

case hardening
(b)

flame hardening
(c)

nitriding
(d)

any one of these
Answer:

Option (c)

37.

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)

38.

The process which improves the machinability of steels, but lowers the hardness and tensile strength, is

(a)

normalising
(b)

full annealing
(c)

process annealing
(d)

spheroidising
Answer:

Option (d)

39.

Which of the following is a case hardening process?

(a)

Carburising
(b)

Cyaniding
(c)

Nitriding
(d)

all of these
Answer:

Option (d)

40.

The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known 

(a)

carburising
(b)

cyaniding
(c)

flame hardening
(d)

induction hardening
Answer:

Option (b)

Showing 31 to 30 out of 40 Questions
1 2 3 4