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- Question
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is
Options- A. added to the feed slurry.
- B. precoated on the filter medium prior to filtration.
- C. separated from the cake by dissolving solids or by burning it off.
- D. all 'a', 'b'&'c'.
- Correct Answer
- all 'a', 'b'&'c'.
- 1. Quartz is
Options- A. stable form of silica upto 870°C.
- B. converted to tridymite on firing between 870 to 1470°C.
- C. transformed to crystoballite on heating above 1470°C.
- D. all (a), (b) and (c). Discuss
- 2. In a heat exchanger, floating head is provided to
Options- A. facilitate cleaning of the exchanger.
- B. increase the heat transfer area.
- C. relieve stresses caused by thermal expansion.
- D. increase log mean temperature gradient. Discuss
- 3. A moderator __________ the neutrons.
Options- A. slows down
- B. absorbs
- C. accelerates
- D. reflects Discuss
- 4. 75% of a radioactive element decays in 6 hours. Its half life period is __________ hours.
Options- A. 3/4
- B. 1/6
- C. 3
- D. 4 Discuss
- 5. Electric furnace method for production of phosphorous uses phosphate rock
Options- A. and phosphoric acid
- B. and coke
- C. and sulphuric acid
- D. silica and coke Discuss
- 6. Maximum stability of white phosphorous is at
Options- A. very high pressure
- B. atmospheric pressure
- C. room temperature
- D. >600°C Discuss
- 7. Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
Options- A. ?
- B. 0
- C. 1
- D. 0.24 Discuss
- 8. The filtrate flow rate in constant pressure filtration
Options- A. continuously increases.
- B. continuously decreases.
- C. remains constant throughout.
- D. may increase or decrease ; depends on the pressure. Discuss
- 9. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
Options- A. highly
- B. moderately
- C. extremely
- D. very extremely Discuss
- 10. Green house effect is accentuated by
Options- A. deforestation.
- B. rapid industrialisation.
- C. increased transportation activity.
- D. all (a), (b) and (c). Discuss
More questions
Correct Answer: all (a), (b) and (c).
Correct Answer: relieve stresses caused by thermal expansion.
Correct Answer: slows down
Correct Answer: 3
Correct Answer: silica and coke
Correct Answer: >600°C
Correct Answer: 1
Correct Answer: continuously decreases.
Correct Answer: moderately
Correct Answer: all (a), (b) and (c).
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