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- Question
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Options- A. by chemical coagulation.
- B. in sedimentation tanks equipped with mechanical scrapper.
- C. in vacuum filter.
- D. in clarifiers.
- Correct Answer
- in sedimentation tanks equipped with mechanical scrapper.
- 1. In case of design of a shell and tube heat exchanger,
Options- A. minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch.
- B. minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter.
- C. O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres.
- D. all (a), (b) & (c). Discuss
- 2. In shell and tube heat exchangers, straight tie rods are used to
Options- A. hold baffle in space.
- B. fix the tubes in position.
- C. account for thermal strain.
- D. none of these. Discuss
- 3. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
Options- A. 5
- B. 100
- C. 1000
- D. 2000 Discuss
- 4. The chamber process is
Options- A. preferred over contact process for producing 98 to 100% H2SO4 and various oleums.
- B. non-catalytic and operates only on pyrites.
- C. a batch process for directly producing high strength (98 to 100%) H2SO4.
- D. none of these. Discuss
- 5. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options- A. 1520
- B. 1630
- C. 1670
- D. 1730 Discuss
- 6. Ideal solution is formed, when its components have zero
Options- A. heat of mixing.
- B. volume change.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 7. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the
Options- A. temperature.
- B. volume of solution.
- C. moles of non-volatile solute.
- D. none of these. Discuss
- 8. For the transportation of ultrafine particles, the equipment used is a........conveyor.
Options- A. belt
- B. pneumatic
- C. screw
- D. none of these Discuss
- 9. Physical absorption is
Options- A. an irreversible phenomenon.
- B. a reversible phenomenon.
- C. accompanied by evolution of heat.
- D. both (b) and (c) Discuss
- 10. Name the endothermic reaction out of the following:
Options- A. Catalytic cracking.
- B. Hydrocracking.
- C. Dehydrogeneration of naphthene to produce aromatic.
- D. Catalytic polymerisation. Discuss
More questions
Correct Answer: all (a), (b) & (c).
Correct Answer: hold baffle in space.
Correct Answer: 5
Correct Answer: none of these.
Correct Answer: 1730
Correct Answer: both (a) & (b).
Correct Answer: temperature.
Correct Answer: pneumatic
Correct Answer: both (b) and (c)
Correct Answer: Dehydrogeneration of naphthene to produce aromatic.
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