Mass Transfer

251.In case of an ideal solution, the total vapor pressure varies _________ with the composition expressed as mole fraction,

  1. Inversely
  2. Linearly
  3. Exponentially
  4. None of these

Correct answer: (B)
Linearly

252.In case of an unsaturated mixture of gas and vapor, the percentage saturation is _________ its relative saturation.

  1. Lower than
  2. Higher than
  3. Equal to
  4. Either (A) or (B), depends on the mixture composition

Correct answer: (A)
Lower than

253.In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of

  1. Area between operating line and 45° diagonal x-y diagram
  2. Condenser and reboiler surfaces
  3. Tower cross-section
  4. None of these

Correct answer: (A)
Area between operating line and 45° diagonal x-y diagram

254.In case of constant underflow extraction operation, the _________ at all solute concentration.

  1. Solids are drained to the same extent
  2. Ratio of the insoluble to solution is constant
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) & (B)

255.In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the _________ number.

  1. Lewis
  2. Grashoff
  3. Sherwood
  4. None of these

Correct answer: (A)
Lewis

256.In case of gases, the binary diffusivity is proportional to (where, P = pressure).

  1. P
  2. 1/P
  3. 1/√P
  4. √P

Correct answer: (B)
1/P

257.In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

  1. Temperature and pressure
  2. Concentration
  3. Nature of the constituents
  4. None of these

Correct answer: (D)
None of these

258.In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

  1. T
  2. √T
  3. T2
  4. 1/T

Correct answer: (A)
T

259.In case of non-ideal gases and liquids, the molal diffusivity

  1. Varies inversely as the pressure
  2. Varies directly as the pressure
  3. Is independent of pressure
  4. Is equal to the volumetric diffusivity

Correct answer: (C)
Is independent of pressure

260.In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

  1. Equal to the heat of formation of surface compound
  2. Equal to the heat of wetting
  3. Zero
  4. Called integral heat of adsorption

Correct answer: (B)
Equal to the heat of wetting

Previous
Page 26 of 62
Next
Copyright © EngineeringMCQ.com