Deck 1: Heat Treatment Processes for Steel

Question 1

An eutectoid steel consists of

A)wholly pearlite
B)wholly austenite
C)pearlite and ferrite
D)pearlite and cementite

Answer 1

wholly pearlite

Question 2

In normalizing, one of the following is not correct

A)it relieves internal stresses
B)it produces a uniform structure
C)the rate of cooling is rapid
D)the rate of cooling is slow

Answer 2

the rate of cooling is slow

Question 3

Fine grain sizes are obtained by

A)slow cooling
B)increasing nucleation rate
C)decreasing growth rate
D)fast cooling

Answer 3

slow cooling

Question 4

Which one of the following is not the purpose of full annealing

A)refines grains
B)induces softness
C)removes strains and stresses
D)produces hardest material

Question 5

Annealing is generally done to impart

A)hardness to the material
B)softness to the material
C)brittleness to the material
D)high conductivity to the material

Question 6

Which of the following processes is used to harden a steel?

A)normalizing
B)annealing
C)carburizing
D)quenching

Question 7

The hardness of quenched Martensite

A)increases with increasing carbon percentage
B)decreases as carbon percentage increases
C)first increases and then remains almost constant as the carbon percentage increases
D)first increases and then decreases as carbon percentage increases.

Question 8

Dispersion hardening materials can be produced with the help of followinf process

A)forging
B)rolling
C)powder metallurgy
D)none of the above

Question 9

in case of carbonitriding by diffusion of which elements the surface become harder of the metal

A)only carbon
B)carbon and nitrogen
C)only nitrogen
D)none of the above

Question 10

in case of flame hardening the heat source in the form of

A)lpg gas flame
B)furnace oil flame
C)oxy-acetelene flame
D)none of the above

Question 11

in jominy end quench test sample is quenched by

A)water
B)oil
C)brine water
D)all of the above

Question 12

martempering is also known as

A)marheating
B)marcooling
C)marquenching
D)none of the above

Question 13

In martempering heat treatment, the final phase which obtain

A)ferrite
B)austenite
C)pearlite
D)none of the above

Question 14

In petenting process, which is the final phase obtainafter completion of heat treatment

A)pearlite
B)bainite
C)martensite
D)austenite

Question 15

which of the following metal alloy is suitable for the precipitation hardenable alloy.

A)al-zn
B)al-ni
C)al-cr
D)al-cu

Question 16

Pearlite is harder than ferrite,this statement is-------

A)true
B)false
C)not applicable
D)none of the above

Question 17

Cementite is harder than pearlite,this statement id -------

A)false
B)true
C)not applicable
D)none of the above

Question 18

The Atomic structure of austenite phase is

A)b.c.c
B)b.c.t
C)h.c.p
D)f.c.c

Question 19

The Atomic structure of martensite is

A)b.c.c
B)b.c.t
C)h.c.p
D)f.c.c

Question 20

In case of annealing heat treatment process hypoeutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above

Question 21

In case of Normalizing heat treatment process hypoeutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above

Question 22

In case of hardening heat treatment process hypoeutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above

Question 23

In case of Annealing heat treatment process hypereutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above

Question 24

In case of hardening heat treatment process hypereutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above