Engineering Metallurgy Solved MCQs

1.

An eutectoid steel consists of

A. wholly pearlite
B. wholly austenite
C. pearlite and ferrite
D. pearlite and cementite
Answer» A. wholly pearlite
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» D. the rate of cooling is slow
3.

Fine grain sizes are obtained by

A. slow cooling
B. increasing nucleation rate
C. decreasing growth rate
D. fast cooling
Answer» A. slow cooling
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
Answer» D. produces hardest material
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
Answer» B. softness to the material
6.

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

A. normalizing
B. annealing
C. carburizing
D. quenching
Answer» D. quenching
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.
Answer» C. first increases and then remains almost constant as the carbon percentage increases
8.

Match the phases of steel in Group I with the crystal structures in Group II P. Martensite 1. bcc Q. Cementite 2. fcc R. Austenite 3. bct S. Ferrite 4. Orthorhombic

A. p-3, q-4, r-1, s-2
B. p-2, q-3, r-1, s-4
C. p-3, q-4, r-2, s-1
D. p-4, q-3, r-2, s-1
Answer» C. p-3, q-4, r-2, s-1
9.

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

A. forging
B. rolling
C. powder metallurgy
D. none of the above
Answer» C. powder metallurgy
10.

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
Answer» B. carbon and nitrogen
11.

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
Answer» C. oxy-acetelene flame
12.

in jominy end quench test sample is quenched by

A. water
B. oil
C. brine water
D. all of the above
Answer» A. water
13.

martempering is also known as

A. marheating
B. marcooling
C. marquenching
D. none of the above
Answer» C. marquenching
14.

In martempering heat treatment, the final phase which obtain

A. ferrite
B. austenite
C. pearlite
D. none of the above
Answer» D. none of the above
15.

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

A. pearlite
B. bainite
C. martensite
D. austenite
Answer» A. pearlite
16.

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
Answer» D. al-cu
17.

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

A. true
B. false
C. not applicable
D. none of the above
Answer» A. true
18.

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

A. false
B. true
C. not applicable
D. none of the above
Answer» B. true
19.

The Atomic structure of austenite phase is

A. b.c.c
B. b.c.t
C. h.c.p
D. f.c.c
Answer» D. f.c.c
20.

The Atomic structure of martensite is

A. b.c.c
B. b.c.t
C. h.c.p
D. f.c.c
Answer» B. b.c.t
21.

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

A. ac1
B. ac3
C. acm
D. none of the above
Answer» B. ac3
22.

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

A. ac1
B. ac3
C. acm
D. none of the above
Answer» B. ac3
23.

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

A. ac1
B. ac3
C. acm
D. none of the above
Answer» B. ac3
24.

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

A. ac1
B. ac3
C. acm
D. none of the above
Answer» B. ac3
25.

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

A. ac1
B. ac3
C. acm
D. none of the above
Answer» B. ac3
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