Mass Transfer MCQ

Test your knowledge with important Mass Transfer MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Mass Transfer MCQs at Bissoy

• For absorbing a sparingly soluble gas in a liquid, the
  ক

  Gas side co-efficient should be increased

  খ

  Liquid side coefficient should be increased

  গ

  Gas side co-efficient should be decreased

  ঘ

  Liquid side co-efficient should be decreased
• Adsorption is an unit operation which generally involves __________ systems.
  ক

  Liquid-solid

  খ

  Gas-solid

  গ

  Fluid-solid

  ঘ

  Solid-solid
• Refractory bricks are usually dried in a __________ dryer.
  ক

  Tray

  খ

  Tunnel

  গ

  Conveyor

  ঘ

  Festoon
• Large quantity of silica gel is normally dried in a __________ dryer.
  ক

  Freeze

  খ

  Through circulation

  গ

  Rotary vacuum

  ঘ

  Tray
• Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.
  ক

  5

  খ

  30

  গ

  60

  ঘ

  100
• The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.
  ক

  0.25

  খ

  2.5

  গ

  1.25

  ঘ

  0.0025
• An azeotropic mixture is a __________ mixture.
  ক

  Binary

  খ

  Ternary

  গ

  Constant boiling point

  ঘ

  None of these
• At minimum reflux ratio for a given separation
  ক

  Number of plates is zero

  খ

  Number of plates is infinity

  গ

  Minimum number of the theoretical plates is required

  ঘ

  Separation is most efficient
• For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
  ক

  Calculated

  খ

  Unknown

  গ

  Known

  ঘ

  Not required
• Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
  ক

  Less

  খ

  More

  গ

  Equal

  ঘ

  Either A or B; depends on the packing height
• The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
  ক

  1

  খ

  0.24

  গ

  3.97

  ঘ

  600
• __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
  ক

  Furfural

  খ

  Benzol

  গ

  Butyl acetate

  ঘ

  Hexane
• To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
  ক

  Increase both 'G' and 'S'

  খ

  Decrease both 'G' and 'S'

  গ

  Increase 'S' and decrease 'G'

  ঘ

  Increase 'G' and decrease 'S'
• With increase in pressure, the relative volatility for a binary system
  ক

  Increases

  খ

  Decreases

  গ

  Remains same

  ঘ

  Either A or B, depends on the system
• If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
  ক

  0

  খ

  1

  গ

  > 1
• Danckwerts developed the __________ theory.
  ক

  Penetration

  খ

  Surface renewal

  গ

  Film

  ঘ

  None of these
• Unit operation involved in the prilling of urea is
  ক

  Evaporation

  খ

  Drying

  গ

  Crystallisation

  ঘ

  Both B and C
• Radioactive nuclear waste is treated in
  ক

  Mixer-settler extractor

  খ

  Rotating-disc contactor

  গ

  Pulsed column extractor

  ঘ

  Bollman extractor
• The adiabatic saturation curve for a vapour-gas mixture is
  ক

  Straight line

  খ

  Slightly concave upward

  গ

  Slightly concave downward

  ঘ

  None of these
• Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
  ক

  Agitated vessel

  খ

  Sieve tray column

  গ

  Bubble cap column

  ঘ

  Packed tower
• Deairation (removal of O₂) of water is done by
  ক

  Rectification

  খ

  Absorption

  গ

  Ion-exchange

  ঘ

  Adsorption
• Molality is defined as the number of gm moles of solute per __________ of solvent.
  ক

  litre

  খ

  gm

  গ

  kg

  ঘ

  m³
• Molarity is defined as the number of gm moles of solute per __________ of solvent.
  ক

  Litre

  খ

  Kg

  গ

  Gm

  ঘ

  C.c
• Milk is dried usually in a __________ dryer.
  ক

  Freeze

  খ

  Spray

  গ

  Tray

  ঘ

  Rotary
• Dimension of mass diffusivity is the same as that of
  ক

  Kinematic viscosity

  খ

  Dynamic viscosity

  গ

  Surface tension

  ঘ

  Pressure
• The dimension of diffusivity is same as that of the
  ক

  Density

  খ

  Molal concentration

  গ

  Kinematic viscosity

  ঘ

  Velocity head
• Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
  ক

  Molecular

  খ

  Extractive

  গ

  Steam

  ঘ

  Simple
• Rose oil is extracted from rose leaves using __________ distillation.
  ক

  High pressure

  খ

  Low pressure

  গ

  Extractive

  ঘ

  Steam
• Alcohol is dehydrated using __________ distillation.
  ক

  Extractive

  খ

  Azeotropic

  গ

  Steam

  ঘ

  Molecular
• Raschig ring made of procelain cannot be used for treating concentrated
  ক

  Hydrochloric acid

  খ

  Nitric acid

  গ

  Alkalis

  ঘ

  Sulphuric acid