August 2022

Question: Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
[A].

used for making axle & shafts of aeroplanes, automobiles and locomotives.

[B].

having poor fatigue resistance.

[C].

having poor toughness.

[D].

not helpful in producing cleaner steel due to oxidising action of vanadium.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Molybdenum steels containing 0.15 to 0.40% molybdenum
[A].

are prone to temper brittleness.

[B].

are used for automobile parts like gears, axle, shaft, bearings etc.

[C].

have very poor fatigue resistance.

[D].

do not contain nickel or chromium or both.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
[A].

1.5-2

[B].

3.5-4.5

[C].

7-9

[D].

12-14

Answer: Option D

Explanation:

No answer description available for this question.

Question: ‘Semi steel’ is
[A].

produced by adding 10-20% steel to the cupola charge.

[B].

stronger than cast iron.

[C].

both (a) and (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Addition of nickel to copper improves its
[A].

machinability

[B].

ductility

[C].

strength

[D].

hardness

Answer: Option D

Explanation:

No answer description available for this question.

Question: Creep is not exhibited at low temperature by
[A].

rubber

[B].

acrylics

[C].

lead

[D].

plastics

Answer: Option C

Explanation:

No answer description available for this question.

Question: Interchain forces are the weakest in case of
[A].

plastics

[B].

fibres

[C].

elastomers

[D].

both rubber & elastomers

Answer: Option D

Explanation:

No answer description available for this question.

Question: Invar contains the highest percentage of
[A].

vanadium

[B].

iron

[C].

tungsten

[D].

cobalt

Answer: Option B

Explanation:

No answer description available for this question.

Question: Heavy duty bearings are usually made of
[A].

white metal

[B].

phosphorous bronze

[C].

monel

[D].

zinc

Answer: Option A

Explanation:

No answer description available for this question.