Discussion
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- Question
Which of the following types of reactors is the safest from operation point of view?
Options- A. A vapor phase reactor.
- B. Pot type reactor.
- C. A liquid phase reactor.
- D. A liquid phase catalytic reactor.
- Correct Answer
- A vapor phase reactor.
- 1. Overall tray efficiency of a distillation column is the ratio of the number of
Options- A. overall gas transfer units to the number of ideal trays required.
- B. ideal trays required to the number of real trays required.
- C. real trays required to the number of ideal trays required.
- D. none of these. Discuss
- 2. The maximum liquid gradient over a tray must not exceed
Options- A. 0.5" -1.25".
- B. 2"-3.5".
- C. 5".
- D. half the tray spacing. Discuss
- 3. Thin spherical shells subjected to internal pressure, develop __________ stresses.
Options- A. radial
- B. circumferential
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.
Options- A. 2-3
- B. 5-8
- C. 10-15
- D. 20-25 Discuss
- 5. In a shell and tube heat exchanger, tube side __________ of the mass velocity.
Options- A. heat transfer co-efficient is proportional to 0.8th power
- B. pressure drop is proportional to the square
- C. both 'a' & 'b'
- D. neither 'a' nor 'b' Discuss
- 6. Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
Options- A. Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column.
- B. Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hence insulation required is less.
- C. Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm2 .
- D. Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2 . Discuss
- 7. Normal screwed fittings are used for pipes upto a diameter of __________ inches.
Options- A. 1.5
- B. 3
- C. 5
- D. 7 Discuss
- 8. A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by
Options- A. (ph - dh)/ph
- B. (ph - dh . dt/2)/ph
- C. (ph - dt)/ph
- D. (ph - dh)/dh Discuss
- 9. Diameter of the seive tray column is determined by the
Options- A. lower limit of vapour velocity.
- B. upper limit of the vapour velocity.
- C. hole diameter of the seive tray.
- D. height of the plate spacing. Discuss
- 10. __________ shapedroof is the most commonly used roof for cylinderical storage tanks.
Options- A. Conical
- B. Flat
- C. Dome
- D. Umbrella Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: ideal trays required to the number of real trays required.
Correct Answer: 0.5" -1.25".
Correct Answer: radial
Correct Answer: 5-8
Correct Answer: both 'a' & 'b'
Correct Answer: Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2 .
Correct Answer: 3
Correct Answer: (ph - dt)/ph
Correct Answer: upper limit of the vapour velocity.
Correct Answer: Conical
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