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- Question
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ? = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier cross-section H = hold up of solid.)
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. Value of Peclet number = ?, is the representative of
Options- A. laminar flow.
- B. complete back mixing,
- C. plug flow.
- D. eddy diffusivity = 0. Discuss
- 2. Hole diameter of the seive trays in the distillation column ranges from __________ mm.
Options- A. lto3
- B. 4 to 8
- C. 3 to 12.5
- D. 12.5 to 18.5 Discuss
- 3. For a given fluid, as the pipe diameter increases, the pumping cost
Options- A. decreases.
- B. increases.
- C. remains unaffected.
- D. may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion. Discuss
- 4. Ratio of tube length to shell diameter for a shell and tube heat exchanger is
Options- A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers.
- B. 4 : 1 to 8 : 1 for liquid-liquid exchanger.
- C. < 4 : 1 for gas-gas exchangers.
- D. both(b) & (c). Discuss
- 5. Which of the following is the best tube material from thermal conductivity point of view alone?
Options- A. Aluminium
- B. Stainless steel
- C. Copper
- D. Carbon steel Discuss
- 6. The dust collection efficiency of electrostatic precipitator increases with increase in the
Options- A. gas flow rate.
- B. electrode area.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 7. Shortest distance between two tubes is
Options- A. called tube pitch.
- B. called tube clearance.
- C. more in case of triangular pitch as compared to square pitch of tube layout.
- D. none of these. Discuss
- 8. In the design of a bag filter, the gas temperature is an important consideration, as it affects the
Options- A. gas density
- B. gas viscosity
- C. fibre selection
- D. all (a), (b) & (c) Discuss
- 9. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to
Options- A. G0.2
- B. G0.5
- C. G0.8
- D. G1.5 Discuss
- 10. Pick out the correct statement.
Options- A. It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling
- B. Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes.
- C. Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing.
- D. Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: plug flow.
Correct Answer: 3 to 12.5
Correct Answer: decreases.
Correct Answer: both(b) & (c).
Correct Answer: Copper
Correct Answer: electrode area.
Correct Answer: called tube clearance.
Correct Answer: all (a), (b) & (c)
Correct Answer: G0.8
Correct Answer: Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding.
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