Chemical Engineering

Question: Boiling point elevation of an ideal solution
[A].

increases rapidly with temperature rise.

[B].

decreases rapidly with temperature rise

[C].

in independent of pressure.

[D].

both (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.

Question: In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
[A].

through a metallic wall.

[B].

by direct contact of hot flue gas with air.

[C].

by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
[A].

180

[B].

970

[C].

3.97

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Evaporation by thermocompression results in the
[A].

saving of steam.

[B].

realisation of multiple effect economy in a single effect.

[C].

both (a) and (b).

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For hot feed, forward feeding as compared to backward feeding results in __________ economy.
[A].

increased

[B].

decreased

[C].

no effect on

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in
[A].

increased economy

[B].

decreased economy

[C].

lower capacity

[D].

no effect on economy

Answer: Option A

Explanation:

No answer description available for this question.

Question: Economy of a multiple effect evaporator is not influenced much by the
[A].

boiling point elevations

[B].

temperature of the feed

[C].

rate of heat transfer

[D].

ratio of the weight of the thin liquor to thick liquor

Answer: Option A

Explanation:

No answer description available for this question.

Question: The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the
[A].

solution has an elevation of boiling point.

[B].

evaporators operate under vacuum.

[C].

evaporators opreate at atmospheric pressure.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Economy of a multiple effect evaporator depends upon the
[A].

heat balance consideration

[B].

rate of heat transfer

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.
[A].

velocity of circulation

[B].

liquor-film co-efficient

[C].

both (a) and (b)

[D].

neither (a) and (b)

Answer: Option D

Explanation:

No answer description available for this question.