Chemical Engineering - Heat Transfer

26. 

Pick out the wrong statement.

A. 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate'.
B. In heat exchanger calculations (Δt)weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling.
C. Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.
D. In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

27. 

What is the geometric mean of two heat transfer areas A1 and A2 ?

A. A1 . A2
B. A1 + A2
C. A1 . A2
D. 2 A1 . A2

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

28. 

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. Let us discuss.

29. 

Forced circulation evaporators are normally used for concentrating liquids having

A. scaling characteristics
B. high viscosity
C. both(a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

30. 

Steam economy in case of a triple effect evaporator will be

A. 1
B. < 1
C. > 1
D. between 0 and 1

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

« Prev   1 2 3 4 5 6