Discussion
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- Question
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
- Correct Answer
- (ph - dt)/ph
- 1. Normal screwed fittings are used for pipes upto a diameter of __________ inches.
Options- A. 1.5
- B. 3
- C. 5
- D. 7 Discuss
- 2. 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
- 3. 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. Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. __________ shapedroof is the most commonly used roof for cylinderical storage tanks.
Options- A. Conical
- B. Flat
- C. Dome
- D. Umbrella Discuss
- 8. In the design of a paddle agitator, the ratio
is normally taken as
Options- A. 0.1
- B. 0.8
- C. 0.25
- D. 0.5 Discuss
- 9. In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is
Options- A. < 10
- B. > 10
- C. > 20
- D. 30 Discuss
- 10. __________ is the determining factor for the number of bubble caps to be used per tray.
Options- A. Permissible slot velocity
- B. Tray diameter
- C. Liquid load
- D. Vapor load Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 3
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: A vapor phase reactor.
Correct Answer: ideal trays required to the number of real trays required.
Correct Answer: 0.5" -1.25".
Correct Answer: upper limit of the vapour velocity.
Correct Answer: Conical
Correct Answer: 0.8
Correct Answer: > 10
Correct Answer: Permissible slot velocity
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