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MCQs

Total Questions : 3241 | Page 32 of 325 pages
Question 311. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.
  1.    Molal
  2.    Relative
  3.    Percentage
  4.    None of these
 Discuss Question
Answer: Option A. -> Molal
Question 312. Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.
  1.    Lower than
  2.    Higher than
  3.    Same as
  4.    Either same or higher than
 Discuss Question
Answer: Option A. -> Lower than
Question 313. The relative volatility of a binary mixture at the azeotropic composition is
  1.    1
  2.    > 1
  3.    0
  4.    ∞
 Discuss Question
Answer: Option A. -> 1
Question 314. Freundlich equation applies to the adsorption of solute from
  1.    Dilute solutions, over a small concentration range
  2.    Gaseous solutions at high pressure
  3.    Concentrated solutions
  4.    None of these
 Discuss Question
Answer: Option A. -> Dilute solutions, over a small concentration range
Question 315. Packed column distillation is limited to the column __________ metres.
  1.    Height < 6
  2.    Diameter < 0.6
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 316. The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is
  1.    D/a
  2.    D/2a
  3.    Proportional to √D
  4.    Dependent on the Reynolds number
 Discuss Question
Answer: Option D. -> Dependent on the Reynolds number
Question 317. Inside the distillation columns, the
  1.    Highest temperatures is near the feed plate
  2.    Driving force for the liquid flow is its weight
  3.    Vapors are not always at their dew points
  4.    All of the above
 Discuss Question
Answer: Option B. -> Driving force for the liquid flow is its weight
Question 318. If moisture content of solid on dry basis is X, then the same on wet basis is
  1.    X/(X + 1)
  2.    X/(X - 1)
  3.    (X + 1)/X
  4.    (X - 1)/X
 Discuss Question
Answer: Option A. -> X/(X + 1)
Question 319. According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)
  1.    μ
  2.    1/μ
  3.    √μ
  4.    μ²
 Discuss Question
Answer: Option B. -> 1/μ
Question 320. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
  1.    Higher dew point
  2.    Higher absolute (specific) humidity
  3.    Higher relative humidity
  4.    Higher wet bulb temperature
 Discuss Question
Answer: Option C. -> Higher relative humidity

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