Theoretical Stages MCQ

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• If reflux increases, then the cost of operation
  ক

  First increases then decreases

  খ

  Goes on increasing

  গ

  Approaches infinity

  ঘ

  First decreases then increases
• If stages are fixed, then Reflux ratio
  ক

  Decreases

  খ

  Increases

  গ

  Equates to 0

  ঘ

  Approaches infinity.
• Optimum reflux ratio ranges between
  ক

  2 to 5

  খ

  2 to 3

  গ

  1.0 to 1 .5

  ঘ

  1.0 to 2.5
• The boil up ratio can be defined as ratio of
  ক

  V/L

  খ

  D/V

  গ

  V/W

  ঘ

  L/W
• The external reflux ratio can be defined as
  ক

  L0/D

  খ

  D/L

  গ

  D0/L

  ঘ

  V/L
• Minimum number of trays can be calculated using
  ক

  Bernoulli’s Eon

  খ

  Henry’s Law

  গ

  Fenske’s Equation

  ঘ

  Homotomy Equation
• When rectifying and stripping both are combined in single stage process this is
  ক

  Differentiation

  খ

  Fractionation

  গ

  Recycle

  ঘ

  Purging
• When Cooling is applied to condense a part of overhead product it is called
  ক

  Reflux

  খ

  Dew point

  গ

  Boil Up

  ঘ

  Relative BP
• When heat is supplied to bottom of liquid stage to vaporize a portion it is called
  ক

  Condensing

  খ

  Boil up

  গ

  Cooling

  ঘ

  Desalting
• An ideal distillation stage is the one that
  ক

  Operates at steady state

  খ

  Operates at High temperature

  গ

  Operates at Low pressure

  ঘ

  Operates at high pressure