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- Question
Which of the following is the most suitable for extraction in a system having very low density difference?
Options- A. Mixer-settler extractor
- B. Centrifugal extractor
- C. Pulsed extractor
- D. Packed extraction tower
- Correct Answer
- Centrifugal extractor
- 1. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
Options- A. pottery furnace
- B. glass melting furnace
- C. crucibles
- D. gas retorts Discuss
- 2. Zircon refractories have
Options- A. low co-efficient of expansion.
- B. high RUL (1600°C) and refractoriness (> 2000°C).
- C. high spalling resistance.
- D. all (a), (b) and (c). Discuss
- 3. COD of raw municipal sewage may be in the range of about __________ mg/litre.
Options- A. 1-2
- B. 5-10
- C. 90-120
- D. 1500-2500 Discuss
- 4. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
Options- A. potential energy
- B. intermolecular forces
- C. kinetic energy
- D. total energy Discuss
- 5. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Options- A. thermal spalling
- B. slag attack
- C. fusion under load
- D. CO attack Discuss
- 6. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT
Options- A. decreases very rapidly
- B. increases very rapidly
- C. remains constant
- D. increases linearly Discuss
- 7. Presence of __________ bacteria in water causes disease like typhoid.
Options- A. aerobic
- B. pathogenic
- C. anaerobic
- D. non-pathogenic Discuss
- 8. ?-rays emission in radioactive disintegration is always accompanied by the emission of
Options- A. ?-rays
- B. ?-rays
- C. neutrons
- D. none of these Discuss
- 9. The biological decomposition of organic substances in wastes controlled conditions is called
Options- A. incineration
- B. biological oxidation
- C. composting
- D. none of these Discuss
- 10. A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be
Options- A. greater than that for uninsulated steam pipe.
- B. less than that of the uninsulated steam pipe.
- C. equal to that of the uninsulated steam pipe.
- D. less than the steam pipe with 5 cms insulation. Discuss
More questions
Correct Answer: gas retorts
Correct Answer: all (a), (b) and (c).
Correct Answer: 90-120
Correct Answer: kinetic energy
Correct Answer: thermal spalling
Correct Answer: decreases very rapidly
Correct Answer: pathogenic
Correct Answer: ?-rays
Correct Answer: composting
Correct Answer: less than that of the uninsulated steam pipe.
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