Discussion
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- Question
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
Options- A. same as that for fluid flow.
- B. less than that for fluid flow.
- C. more than that for fluid flow.
- D. D2 - D1 (D1 and D2 are I.D. of inner and outer pipes respectively).
- Correct Answer
- more than that for fluid flow.
- 1. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
Options- A. 1
- B. < 1
- C. >1
- D. equal to the order of reaction Discuss
- 2. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
Options- A. 0
- B. ?
- C. > 1
- D. < 1 Discuss
- 3. Souders Brown equation given by,
, is used for the calculation of the __________ in a continuous distillation column.
Options- A. diameter of the bubble cap column
- B. diameter of the seive plate column
- C. tray pressure drop
- D. residence time in the downcomer for the disengagement of entrained vapour Discuss
- 4. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation
Options- A. increases capacity.
- B. increases economy.
- C. does not affect the capacity.
- D. both 'b' & 'c'. Discuss
- 5. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is
Options- A. bending
- B. deformation
- C. shear
- D. elongation Discuss
- 6. Pressure differential maintained across a continuous rotary vacuum filter is in the range of __________ mm Hg column.
Options- A. 50 to 100
- B. 100 to 150
- C. 250 to 500
- D. 600 to 700 Discuss
- 7. Liquid gradient over a tray can be minimised by
Options- A. providing a higher skirt clearance or a higher weir.
- B. decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow.
- C. using split flow, radial flow or cascade flow for column diameter large than 4 ft.
- D. all (a), (b) and (c). Discuss
- 8. Scale up problem in design based on the similarity concept takes into account __________ similarity.
Options- A. geometrical
- B. kinematic
- C. dynamic
- D. all (a), (b) and (c) Discuss
- 9. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").
Options- A. half
- B. three fourth
- C. equal to
- D. 1.5 times Discuss
- 10. Cylinderical shell thickness of rotary drier is generally __________ mm.
Options- A. 2-3
- B. 18-22
- C. 6-8
- D. 12-15 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: >1
Correct Answer: ?
Correct Answer: diameter of the bubble cap column
Correct Answer: both 'b' & 'c'.
Correct Answer: bending
Correct Answer: 250 to 500
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c)
Correct Answer: equal to
Correct Answer: 6-8
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