CHEMICAL ENGINEERING

Question: Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of
[A].

hydrochloric acid

[B].

methyl alcohol

[C].

formic acid

[D].

nitric acid

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increase in temperature, the electrical conductivity of semiconductors
[A].

increases.

[B].

decreases.

[C].

remain constant.

[D].

either (a) or (b), depends on the type of semi-conductor.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Normalising does not __________ of a metal.
[A].

improve machinability & tensile strength

[B].

remove internal stresses

[C].

refine the structure

[D].

remove strains caused by cold working

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ flux is used for the extraction of metal from its self fluxing ores.
[A].

No

[B].

Acid

[C].

Basic

[D].

Neutral

Answer: Option A

Explanation:

No answer description available for this question.

Question: Corrosion of metals can not be prevented by its
[A].

tempering

[B].

chromising

[C].

aluminising

[D].

alloying

Answer: Option A

Explanation:

No answer description available for this question.

Question: Energy required to compress a hot gas as compared to cold gas will be
[A].

more.

[B].

less.

[C].

same.

[D].

more or less depending upon the nature of the gas.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In connection with corrosion of metals, passivation is the process that
[A].

intensifies deterioration.

[B].

changes the composition of the metal.

[C].

inhibits further deterioration.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Failure of a material is attributed to __________ if it fails below its yield point.
[A].

impact loading

[B].

fatigue

[C].

creep

[D].

straining

Answer: Option B

Explanation:

No answer description available for this question.

Question: Materials having __________ lattice structure are usually the most ductile.
[A].

body centred cubic (bcc)

[B].

hexagonal close packed (hcp)

[C].

face centred cubic (fcc)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Dryness fraction of dry steam is
[A].

0

[B].

∞

[C].

1

[D].

0.5

Answer: Option C

Explanation:

No answer description available for this question.