Author name: admin

Question: Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
[A].

high strength to weight ratio.

[B].

low temperature strength properties.

[C].

its ability to be cast, rolled, forged & stamped.

[D].

high strength and corrosion & oxidation-resistance at elevated temperature.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Aluminium as a material of construction suffers from the disadvantage of
[A].

very high cost.

[B].

rather low tensile strength.

[C].

very low strength to weight ratio.

[D].

scarce availability.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Monel alloy is
[A].

the costliest of all the alloys of nickel.

[B].

not suitable for making kitchen utensils.

[C].

used for making steam valves and turbine blades as it resists steam attack at high temperature.

[D].

not used in cast and wrought forms.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Nickel base alloys with __________ are known as monel metal.
[A].

zinc

[B].

tin

[C].

copper

[D].

molybdenum

Answer: Option C

Explanation:

No answer description available for this question.

Question: ‘Hypersil’ is a __________ steel.
[A].

high speed

[B].

silicon

[C].

molybdenum

[D].

tungsten

Answer: Option B

Explanation:

No answer description available for this question.

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.