Chemical Engineering

Question: In case of an absorber, the operating
[A].

line always lies above the equilibrium curve.

[B].

line always lies below the equilibrium curve.

[C].

line can be either above or below the equilibrium curve.

[D].

velocity is more than the loading velocity.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Flooding in a column results due to
[A].

high pressure drop

[B].

low pressure drop

[C].

low velocity of the liquid

[D].

high temperature

Answer: Option A

Explanation:

No answer description available for this question.

Question: Berl saddle made of carbon cannot be used for
[A].

alkalis

[B].

SO2

[C].

H2SO4

[D].

oxidising atmosphere

Answer: Option D

Explanation:

No answer description available for this question.

Question: At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
[A].

is greater than

[B].

is lower than

[C].

is same as

[D].

cannot be predicted as data are insufficient

Answer: Option A

Explanation:

No answer description available for this question.

Question: Operating velocity in a packed tower is usually __________ the flooding velocity.
[A].

half

[B].

twice

[C].

equal to

[D].

more than

Answer: Option A

Explanation:

No answer description available for this question.

Question: Flooding results in
[A].

high tray efficiency

[B].

low tray efficiency

[C].

high gas velocity

[D].

good contact between the fluids

Answer: Option B

Explanation:

No answer description available for this question.

Question: Channelling is most severe
[A].

in towers packed with stacked packing.

[B].

in towers packed randomly with crushed solids.

[C].

in dumped packing of regular units.

[D].

at very high liquid flow rate.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Lewis number (Le) is
[A].

Sc x Pr

[B].

Pr x St

[C].

Sh x Pr

[D].

St x Sh

Answer: Option A

Explanation:

No answer description available for this question.

Question: For contacting a highly soluble gas with a liquid
[A].

bubble the gas through liquid.

[B].

spray the liquid on gas stream.

[C].

either (a) or (b) would suffice.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For absorbing a sparingly soluble gas in a liquid, the
[A].

gas side co-efficient should be increased.

[B].

liquid side coefficient should be increased.

[C].

gas side co-efficient should be decreased.

[D].

liquid side co-efficient should be decreased.

Answer: Option B

Explanation:

No answer description available for this question.