Discussion
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- Question
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
- Correct Answer
- 0.5 to 1
- 1. 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
- 2. 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). Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. In a cylinderical vessel subjected to internal pressure, the longitudinal stress ?L and the circumferential stress, ?n are related by
Options- A. ?h = 2 ?L
- B. ?h = ?L
- C. ?h = ?L/2
- D. no relation exists Discuss
- 10. Rotary driers are most economically designed for the number of heat transfer units (HTU) from
Options- A. 0.01 to 1
- B. 1.5 to 2.5
- C. 5 to 10
- D. 10 to 20 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: > 1
Correct Answer: all (a), (b) and (c).
Correct Answer: decreases very rapidly
Correct Answer: D5
Correct Answer: twice
Correct Answer: both (b) & (c).
Correct Answer:
Correct Answer: all (a), (b) and (c).
Correct Answer: ?h = 2 ?L
Correct Answer: 1.5 to 2.5
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