Discussion
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- Question
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by
Options- A. an increase in liquid viscosity.
- B. an increase in relatived volatility for rectification columns.
- C. decrease in gas solubility for absorbers.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT
Options- A. decreases very rapidly
- B. increases very rapidly
- C. remains constant
- D. increases linearly Discuss
- 2. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
Options- A. D2
- B. D5
- C. D
- D. D9 Discuss
- 3. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.
Options- A. half
- B. equal to
- C. twice
- D. eight times Discuss
- 4. The normal range of velocity of steam in pipes is __________ m/sec.
Options- A. 0.1-0.5
- B. 1-5
- C. 10-20
- D. 80-100 Discuss
- 5. The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is
Options- A. < 30
- B. < 7
- C. > 7 < 15
- D. > 20 < 50 Discuss
- 6. What is the slope of the operating line in the stripping section of a distillation column?
Options- A. 0
- B. ?
- C. > 1
- D. < 1 Discuss
- 7. The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from
Options- A. 0.5 to 1
- B. 1 to 1.5
- C. 1.5 to 2
- D. 2 to 2.5 Discuss
- 8. A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
Options- A. is economical in operation.
- B. employs high velocity, high heat transfer rate and less heating surface requirement.
- C. employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle.
- D. both (b) & (c). Discuss
- 9. In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)
Options- A.
- B. D2 - D1
- C.
- D. none of these Discuss
- 10. Excessive liquid gradient on a tray may result in the
Options- A. maldistribution of gas.
- B. back trapping.
- C. gas blowing beneath cap skit.
- D. all (a), (b) and (c). Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: decreases very rapidly
Correct Answer: D5
Correct Answer: twice
Correct Answer: 80-100
Correct Answer: < 7
Correct Answer: > 1
Correct Answer: 0.5 to 1
Correct Answer: both (b) & (c).
Correct Answer:
Correct Answer: all (a), (b) and (c).
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