CHEMICAL ENGINEERING

Question: An alloy of Fe – 0.4 % C is
[A].

cast iron.

[B].

hypo-eutectoid steel.

[C].

hyper-eutectoid steel.

[D].

eutectoid steel

Answer: Option B

Explanation:

No answer description available for this question.

Question: For preparation of porous bearings by powder metallurgy, preferred particle shape is
[A].

spherical

[B].

nodular

[C].

irregular

[D].

no preferred shape

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a good rimming steel
[A].

carbon and silicon should be low.

[B].

silicon should be low but carbon should be high.

[C].

both silicon & carbon should be high.

[D].

silicon should be high but carbon should be low.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Yield strength of a polycrystalline metal with an average grain size, d, is proportional to
[A].

d1/2

[B].

d-1/2

[C].

d

[D].

d-1

Answer: Option B

Explanation:

No answer description available for this question.

Question: Lithium is a useful alloying addition to aluminium, because it
[A].

is cheap.

[B].

imparts solid solution strengthening.

[C].

lowers density and contributes to age hardening.

[D].

improves the corrosion resistance of aluminium.

Answer: Option D

Explanation:

No answer description available for this question.

Question: It is possible to form martensite
[A].

sometimes by cold working.

[B].

sometimes without nucleation.

[C].

sometimes by gas quenching.

[D].

only in iron based alloys.

Answer: Option D

Explanation:

No answer description available for this question.

Question: At room temperature, F.C.C. crystal structure is observed in
[A].

lead

[B].

cupro-nickel

[C].

titanium

[D].

tungsten

Answer: Option A

Explanation:

No answer description available for this question.

Question: By X-ray diffraction, it is not possible to determine the
[A].

preferred orientation.

[B].

residual localised stresses.

[C].

particle size.

[D].

ordered arrangement of magnetic moments.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Basicity [%Cao + %MgO/% SiO2) of the slag in Indian blast furnace is in the range of
[A].

0.7-1.0

[B].

1.1-1.4

[C].

1.5 – 1.8

[D].

2.0 – 2.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
[A].

strain rate is increased.

[B].

grain size is increased.

[C].

prior cold deformation is increased.

[D].

not affected by any of the above parameters.

Answer: Option A

Explanation:

No answer description available for this question.