Discussion
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- Question
Pressure drop due to pipe fittings can be estimated by the equation,
, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of 
(dimensionless) for 45° elbow and 180° close return bends would be respectively around
Options- A. 5 and 10
- B. 45 and 75
- C. 180 and 300
- D. 300 and 500
- Correct Answer
- 45 and 75
- 1. Nominal size of a pipe is an indication of its __________ diameter.
Options- A. inner
- B. outer
- C. approximate
- D. none of these Discuss
- 2. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line)
Options- A. S1/S2
- B. S1.S2
- C. S2/S1
- D. 1/S1.S2 Discuss
- 3. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually
Options- A. 30°
- B. 45°
- C. 60°
- D. 75° Discuss
- 4. In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
Options- A. molal flow rate of vapour
- B. vapour molecular weight
- C. pressure and temperature
- D. all (a), (b) and (c) Discuss
- 5. In shell and tube heat exchangers, straight tie rods are used to
Options- A. hold baffle in space.
- B. fix the tubes in position.
- C. account for thermal strain.
- D. none of these. Discuss
- 6. The retention time of material in a rotary dryer depends upon its
Options- A. rpm
- B. slope & length
- C. flights arrangement
- D. all (a), (b) and (c) Discuss
- 7. Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing
Options- A. rupture diaphragm
- B. dikes
- C. surge chamber
- D. none of these Discuss
- 8. 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
- 9. 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
- 10. 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
Process Equipment and Plant Design problems
Search Results
Correct Answer: approximate
Correct Answer: S1/S2
Correct Answer: 60°
Correct Answer: all (a), (b) and (c)
Correct Answer: hold baffle in space.
Correct Answer: all (a), (b) and (c)
Correct Answer: rupture diaphragm
Correct Answer: < 7
Correct Answer: 80-100
Correct Answer: twice
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