Mass Transfer Operations - I Mid - II, November - 2014

1.Removal of moisture from a substance is called
  • Distillation
  • Drying
  • Crystallization
  • RO
Answer: B
2.The dryers suitable for handling slurries or parts of solids in fine suspension and for solutions
  • Rotary dryers
  • Spray dryers
  • Tray dryers
  • Drum dryers
Answer: D
3.Psychrometric chart gives the properties of __________
  • Water
  • Air
  • Temperature
  • Pressure
Answer: B
4.Constant dew point lines are __________
  • Horizontal
  • Vertical
  • Diagonal
  • None of these
Answer: A
5.RH gives the ___________ in humidification process
  • Dry bulb temperature
  • Wet bulb temperature
  • Moisture content
  • Enthalpy
Answer: C
6.In absorption, the mass transfer occurs from
  • Liquid-Liquid
  • Gas-Liquid
  • Solid-Gas
  • Gas-Gas
Answer: B
7.The solvent chosen for absorption must have
  • High affinity for solute
  • Low affinity for solute
  • Equal affinity for solute and gas
  • No affinity
Answer: A
8.The number of components in absorption are
  • 1
  • 2
  • 3
  • 4
Answer: C
9.As the operating line and the equilibrium curve come very close to each other ‘N’ value
  • Doesn’t change
  • Decreases
  • Slightly increases
  • Becomes infinite
Answer: D
10.Venturi scrubber is used for
  • Distillation
  • Absorption
  • Humidification
  • Drying
Answer: B
11.Drying kinetics is initially _____________ order.
Answer: First
12.An operation in which a gas mixture is contacted with a liquid for preferentially dissolving one or more components of the gas and provided solution of them in the liquid is ______________
Answer: Absorption
13.Sublimation of solid occurs in _____________ drying
Answer: Freeze
14.The number of components in distillation is ________________
Answer: Two
15._____________ is the amount of water content in air.
Answer: Humidity
16.The science of measuring water vapour content in air is called__________________
Answer: Psychrometry
17.Ammonical air is stripped of ammonia using _______________ solvent.
Answer: Water
18.The driving force of mass transfer of solute from carrier gas to liquid is _____________
Answer: Concentration
19.____________flow of liquid and gas increases mass transfer in absorption.
Answer: Turbulent
20.Point tray efficiency is also called as________________________
Answer: Murphree efficiency