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- Question
Pick out the wrong statement pertaining to the roll crushers.
Options- A. Maximum feed size determines the required roll diameter.
- B. For hard material's crushing, the reduction ratio should not exceed 4.
- C. Both the rolls run necessarily at the same speed.
- D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced.
- Correct Answer
- Both the rolls run necessarily at the same speed.
- 1. Polyvinyl alcohol is used as a
Options- A. cation/anion exchanger.
- B. water soluble adhesive.
- C. textile fibre.
- D. non-sticky coating on frying pans. Discuss
- 2. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?
Options- A. Size, shape, orientation and surface of the packing particles.
- B. Density and viscosity of fluids.
- C. Fluid flow rates.
- D. All (a), (b) and (c). Discuss
- 3. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
Options- A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates.
- B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap.
- C. Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
- D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. Discuss
- 4. In case of a continuous distillation column, increase in reflux ratio may result in the
Options- A. lower fixed charges for the column.
- B. greater cost for the reboiler heat supply.
- C. greater cost for the condenser coolant.
- D. all (a), (b) and (c). Discuss
- 5. Chrome magnesite bricks are
Options- A. acidic in nature.
- B. neutral in nature.
- C. having higher RUL than silica bricks.
- D. made by mixing 30% chromite and 70% periclase. Discuss
- 6. The normal range of velocity of water in pipes is __________ m/sec.
Options- A. 0.1-0.5
- B. 1-2
- C. 10-50
- D. 15-30 Discuss
- 7. Vulcanisation of rubber
Options- A. decreases its tensile strength.
- B. increases its ozone & oxygen reactivity.
- C. increases its oil & solvent resistance.
- D. converts its plasticity into elasticity. Discuss
- 8. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by
Options- A. an increase in liquid viscosity.
- B. an increase in relatived volatility for rectification columns.
- C. decrease in gas solubility for absorbers.
- D. all (a), (b) and (c). Discuss
- 9. Porosity of silica bricks varies from __________ percent.
Options- A. 5 to 10
- B. 20 to 30
- C. 45 to 60
- D. 60 to 75 Discuss
- 10. Petroleum coke is commercially produced by the __________ process.
Options- A. hydrocracking
- B. visbreaking
- C. fluid catalytic cracking
- D. delayed coking Discuss
More questions
Correct Answer: water soluble adhesive.
Correct Answer: All (a), (b) and (c).
Correct Answer: Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
Correct Answer: all (a), (b) and (c).
Correct Answer: having higher RUL than silica bricks.
Correct Answer: 1-2
Correct Answer: converts its plasticity into elasticity.
Correct Answer: all (a), (b) and (c).
Correct Answer: 20 to 30
Correct Answer: delayed coking
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