Heat Transfer

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.

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

capacity of the evaporator is decreased.

[B].

capacity of the evaporator is increased.

[C].

true temperature drop increases.

[D].

both (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient
[A].

increases

[B].

decreases

[C].

is not affected

[D].

may increase or decrease; depends on the feed

Answer: Option B

Explanation:

No answer description available for this question.