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- Question
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
Options- A. cost
- B. electrical conductivity
- C. thermal conductivity
- D. fusion point
- Correct Answer
- cost
- 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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