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- Question
Pick out the wrong statement about the design of a sieve plate column.
Options- A. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns.
- B. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design.
- C. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns.
- D. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.
- Correct Answer
- Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.
- 1. Which of the following efficiencies can be greater than 100%?
Options- A. Overall plate efficiency.
- B. Murphree plate efficiency.
- C. Point efficiency.
- D. None of these. Discuss
- 2. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?
Options- A. Molten sodium cooled
- B. CO2 gas cooled
- C. Pressurised water
- D. Boiling water Discuss
- 3. Which of the following undergoes fission reaction easily?
Options- A. U-235
- B. U-238
- C. Th-232
- D. none of these Discuss
- 4. Which of the following is not used as a moderator in nuclear reactor?
Options- A. Molten sodium
- B. Light water
- C. Beryllium
- D. Boron hydride Discuss
- 5. Which of the following nuclear materials is fissile?
Options- A. Uranium-238
- B. Thorium-232
- C. Plutonium-239
- D. None of these Discuss
- 6. In the nuclear reaction, 93N239→ 94Pu239 +?; the missing particle is a/an
Options- A. electron
- B. proton
- C. neutron
- D. position Discuss
- 7. Which of the following ores contains maximum percentage of uranium?
Options- A. Carnotite
- B. Thorium.
- C. Rescolite
- D. Pitchblende Discuss
- 8. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
Options- A. A+Z
- B. A- Z
- C. A
- D. Z Discuss
- 9. Which of the following isotopes is not present in natural uranium?
Options- A. U-238
- B. U-234
- C. U-235
- D. U-232 Discuss
- 10. Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)?
Options- A. Power reactor
- B. Research reactor
- C. Fast breeder reactor
- D. Heavy water plant Discuss
More questions
Correct Answer: Murphree plate efficiency.
Correct Answer: Boiling water
Correct Answer: U-235
Correct Answer: Molten sodium
Correct Answer: Plutonium-239
Correct Answer: electron
Correct Answer: Pitchblende
Correct Answer: A- Z
Correct Answer: U-232
Correct Answer: Research reactor
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