CHEMICAL ENGINEERING

Question: In the commercial production of which of the following metals, matallothermic reduction is used ?
[A].

Copper

[B].

Zinc

[C].

Zirconium

[D].

Nickel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Earing is a defect found in steels after the following metal working operation (s).
[A].

Deep drawing

[B].

Rolling

[C].

Extrusion

[D].

Wire drawing

Answer: Option A

Explanation:

No answer description available for this question.

Question: Liquid nitrogen containers can be made from
[A].

ferritic stainless steel

[B].

HSLA steel

[C].

titanium

[D].

austenitic stainless steel

Answer: Option B

Explanation:

No answer description available for this question.

Question: On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is
[A].

creep

[B].

toughness

[C].

tensile strength

[D].

fatigue

Answer: Option B

Explanation:

No answer description available for this question.

Question: In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
[A].

linearly with time.

[B].

exponentially with time.

[C].

logarithmically with time.

[D].

in proportion to the square root of time.

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in annealing temperature, the following defect density decreases.
[A].

Vacancy

[B].

Dislocation

[C].

Grain boundary

[D].

All of them

Answer: Option D

Explanation:

No answer description available for this question.

Question: Dislocation cross-slip is difficult in those materials, which have
[A].

large number of slip systems.

[B].

high work hardening rate.

[C].

coarse grain size.

[D].

low stacking fault energy.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Malleabilisation heat treatment is performed on
[A].

cast steel

[B].

grey cast iron

[C].

white cast iron

[D].

spheroidal graphite cast iron

Answer: Option C

Explanation:

No answer description available for this question.

Question: Identify the correct statement with reference to the extractive metallurgy of aluminium.
[A].

The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3.

[B].

Approximately 80% of the aluminium deposited on the cathode comes from cryolite.

[C].

Sodium is deposited along with aluminium, but is immediately vaporised.

[D].

Anode effect sets in when the cryolite concentration goes below 40%.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Identify the correct statement.
[A].

Sphlerite is zinc oxide.

[B].

The first law of the thermodynamics is stated as δE = δQ – δW.

[C].

Lead can be produced in a blast furnace.

[D].

T. ferrooxidans is a fungus that can be used for leaching chalcopyrite.

Answer: Option C

Explanation:

No answer description available for this question.