Material Science And Metallurgy (3131904) MCQs

MCQs of Allotropy of Iron, Iron-Iron-Carbide equilibrium system

Showing 41 to 50 out of 79 Questions
2 3 4 5 6 7
41.

The alloy, mainly used for corrosion resistance in stainless steels is

(a)

silicon
(b)

manganese
(c)

carbon
(d)

chromium
Answer:

Option (d)

42.

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

(a)

chromium
(b)

silicon
(c)

manganese
(d)

magnesium
Answer:

Option (c)

43.

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

(a)

chromium
(b)

nickel
(c)

vanadium
(d)

cobalt
Answer:

Option (d)

44.

The machinability of steel is improved by adding

(a)

nickel
(b)

chromium
(c)

nickel and chromium
(d)

sulphur, lead and phosphorus
Answer:

Option (d)

45.

Chromium when added to steel __________ the tensile strength.

(a)

does not effect
(b)

decreases
(c)

increases
(d)

first increase than decrease
Answer:

Option (c)

46.

A small percentage of boron is added to steel in order to

(a)

increase hardenability
(b)

reduce machinability
(c)

increase wear resistance
(d)

increase endurance strength
Answer:

Option (a)

47.

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

(a)

chromium
(b)

nickel
(c)

vanadium
(d)

cobalt
Answer:

Option (d)

48.

The hardness of steel increases if it contains

(a)

pearlite
(b)

ferrite
(c)

cementite
(d)

martensite
Answer:

Option (c)

49.

The presence of hydrogen in steel causes

(a)

reduced neutron absorption cross-section
(b)

improved weldability
(c)

embrittlement
(d)

corrosion resistance
Answer:

Option (c)

50.

The alloying element which can replace tungsten in high speed steels is

(a)

nickel
(b)

vanadium
(c)

cobalt
(d)

molybdenum
Answer:

Option (d)

Showing 41 to 50 out of 79 Questions
2 3 4 5 6 7