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Total Questions : 3241 | Page 34 of 325 pages
Question 331. Which of the following is the most suitable for extraction in a system having very low density difference?
  1.    Mixer-settler extractor
  2.    Centrifugal extractor
  3.    Pulsed extractor
  4.    Packed extraction tower
 Discuss Question
Answer: Option B. -> Centrifugal extractor
Question 332. A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.
  1.    21.7
  2.    20
  3.    27.3
  4.    18.7
 Discuss Question
Answer: Option D. -> 18.7
Question 333. For a binary mixture with low relative volatility,
  1.    Use steam distillation
  2.    Use molecular distillation
  3.    Use high pressure distillation
  4.    An azeotrope may be formed during distillation
 Discuss Question
Answer: Option D. -> An azeotrope may be formed during distillation
Question 334. In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as
  1.    Ri = Re/(1 - Re)
  2.    Ri = (1 - Re)/Re
  3.    Ri = Re
  4.    Ri = Re/(1 + Re)
 Discuss Question
Answer: Option D. -> Ri = Re/(1 + Re)
Question 335. At a fixed total pressure, humidity depends only on the
  1.    Partial pressure of vapour in the mixture
  2.    Heat capacity of the vapour
  3.    Density of the vapour
  4.    None of these
 Discuss Question
Answer: Option A. -> Partial pressure of vapour in the mixture
Question 336. Which of the following is not fixed by the process requirements, in the design of absorbers?
  1.    Flow rate of the entering gas
  2.    Composition of the entering liquid
  3.    Terminal concentrations of gas stream
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 337. HETP is numerically equal to HTU, only when the operating line
  1.    Lies below the equilibrium line
  2.    Lies above the equilibrium line
  3.    And equilibrium lines are parallel
  4.    Is far from the equilibrium line
 Discuss Question
Answer: Option C. -> And equilibrium lines are parallel
Question 338. The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
  1.    √T
  2.    T
  3.    T²
  4.    T³
 Discuss Question
Answer: Option C. -> T²
Question 339. The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
  1.    √T
  2.    T
  3.    T1.5
  4.    T3
 Discuss Question
Answer: Option B. -> T
Question 340. If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is
  1.    0.31
  2.    0.107
  3.    0.017
  4.    0.215
 Discuss Question
Answer: Option D. -> 0.215

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