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- Question
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
Options- A. 0.5 D
- B. D
- C. 1.5 D
- D. 2 D
- Correct Answer
- D
- 1. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.
Options- A. saturated
- B. superheated
- C. unsaturated
- D. dry gaseous Discuss
- 2. Pine oil and cresylic acid are used as __________ in the froth floatation process.
Options- A. frother
- B. collector
- C. depressor
- D. conditioner Discuss
- 3. In a shell and tube heat exchanger, the clearance of the tube is generally
Options- A. not less than one-fourth of the tube diameter or 3/16".
- B. more than the tube diameter.
- C. equal to the tube diameter.
- D. more in case of triangular pitch as compared to the square pitch tube layout. Discuss
- 4. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
Options- A. It is unsuitable for concentrating those liquids, which form a scale or deposit salt.
- B. It is suitable for process, in which the final product is a liquor instead of solid.
- C. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres.
- D. Liquor flows inside the tube, while the steam is outside submerging the tube. Discuss
- 5. The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be
Options- A. 10%
- B. 5%
- C. 18.18%
- D. 20% Discuss
- 6. Pollution by particulate matter emission in the atmosphere does not take place during metal
Options- A. grinding
- B. machining
- C. cutting
- D. polishing Discuss
- 7. Presence of free moisture in coal during its high temperature carbonisation
Options- A. reduces the coking time.
- B. protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- C. increases the loss of fine coal dust from the ovens when charging.
- D. none of these. Discuss
- 8. Bakelite is a/an
Options- A. addition polymer
- B. elastomer
- C. thermoplastic
- D. none of these Discuss
- 9. In the reaction, represented by Na2CO3 + HC1 ? NaHO3 + NaCl, the equivalent weight of Na2CO3 is
Options- A. 53
- B. 5.3
- C. 106
- D. 10.6 Discuss
- 10. The dust collection efficiency of a cyclone separator
Options- A. decreases with increase in gas flow rate.
- B. is inversely proportional to the mass of the dust particle.
- C. is directly proportional to the radius of the dust particle path.
- D. none of these. Discuss
More questions
Correct Answer: superheated
Correct Answer: frother
Correct Answer: not less than one-fourth of the tube diameter or 3/16".
Correct Answer: Liquor flows inside the tube, while the steam is outside submerging the tube.
Correct Answer: 20%
Correct Answer: polishing
Correct Answer: protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
Correct Answer: none of these
Correct Answer: 106
Correct Answer: none of these.
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