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- Question
As the reflux ratio in a distillation coloumn is increased from the minimum, the
Options- A. slope of the operating line in stripping section decreases.
- B. number of plates decreases very slowly first and then more and more rapidly.
- C. total cost first decreases and then increases.
- D. liquid flow increases while the vapor flow decreases for a system.
- Correct Answer
- total cost first decreases and then increases.
- 1. Phosphatic fertiliser is graded based on its __________ content.
Options- A. P2O3
- B. PCl5
- C. P2O5
- D. H3PO4 Discuss
- 2. Pick out the wrong statement pertaining to a shell and tube heat exchanger.
Options- A. The minimum value of baffle spacing is 50 mm.
- B. The maximum value of baffle spacing is equal to the I.D. of the shell.
- C. The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these.
- D. Disk and doughnut baffle is the most commonly used baffle. Discuss
- 3. With increasing flow rate, the hydraulic efficiency of a centrifugal pump
Options- A. monotonically decreases.
- B. decreases and then increases.
- C. remains constant.
- D. increases and then decreases. Discuss
- 4. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
Options- A. 100 to 150
- B. 350 to 450
- C. 550 to 650
- D. 700 to 850 Discuss
- 5. Superphosphate is manufactured by reacting phosphate rock with
Options- A. acetic acid
- B. sulphuric acid
- C. aluminium chloride
- D. none of these Discuss
- 6. The porosity of a compressible cake is
Options- A. minimum at the filter medium.
- B. minimum at the upstream face.
- C. maximum at the filter medium.
- D. same throughout the thickness of cake. Discuss
- 7. __________ moderator is used in a fast breeder reactor.
Options- A. Graphite
- B. Heavy water
- C. Beryllium
- D. No Discuss
- 8. Flash point of an oil gives an idea of the
Options- A. nature of boiling point diagram of the system.
- B. amount of low boiling fraction present.
- C. explosion hazards.
- D. all (a), (b) and (c). Discuss
- 9. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Options- A. Beryllia
- B. Carborundum
- C. Corundum
- D. Thoria Discuss
- 10. Smoke is produced due to
Options- A. insufficient supply of combustion air and insufficient time for combustion.
- B. poor quality of fuel and improper mixing of fuel & combustion air.
- C. poor design & overloading of furnace.
- D. all (a), (b) and (c). Discuss
More questions
Correct Answer: P2O5
Correct Answer: Disk and doughnut baffle is the most commonly used baffle.
Correct Answer: monotonically decreases.
Correct Answer: 350 to 450
Correct Answer: sulphuric acid
Correct Answer: minimum at the filter medium.
Correct Answer: No
Correct Answer: all (a), (b) and (c).
Correct Answer: Beryllia
Correct Answer: all (a), (b) and (c).
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