Falling Film Evaporator MCQ

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• In order to maintain conservation of mass as this fluid fall proceeds in a falling film evaporator, the downward vapour velocity ___________
  ক

  Decreases

  খ

  Increases

  গ

  Remains Same

  ঘ

  Oscillates
• The fluids in falling tube evaporator usually form a film inside the tubes but there are applications when the fluid forms a film outside the tube and falls subsequently.
  ক

  True

  খ

  False
• Which one of the following cannot be regarded as a demerit of falling film evaporator?
  ক

  High headroom requirement

  খ

  Corrosive fluids cannot be used

  গ

  Large product holdup

  ঘ

  Recirculation needed
• Which one of the following is not an advantage of falling film evaporator?
  ক

  Relatively low cost

  খ

  High headroom

  গ

  Large surface area for heating available

  ঘ

  Low product holdup
• Falling film evaporators have __________ product holdup.
  ক

  Large

  খ

  Very high

  গ

  Low

  ঘ

  Zero
• Falling film evaporators can be used with the fluid falling over (i) Plates (ii) Coils (iii) Horizontal tubes (iv) Vertical tubes
  ক

  (i)(ii)(iii)

  খ

  (i)(ii)

  গ

  (i)(iii)(iv)

  ঘ

  (i)(ii)(iii)(iv)
• Falling film evaporators are best suited for pharmaceutical industries because
  ক

  It has high temperature gradient and natural convection

  খ

  Low pressure

  গ

  It has less temperature gradient and natural convection

  ঘ

  High headroom available
• The applications of falling film and rising film are more or less same, but if industries have the cost capital, they go for falling film, why?
  ক

  It has high temperature gradient and natural convection

  খ

  Better efficiency of falling film

  গ

  It has less temperature gradient and natural convection

  ঘ

  No need for upward pressure
• Falling film evaporators are considered over climbing film evaporators because of which one of the following factor?
  ক

  Efficiency

  খ

  Product holdup

  গ

  Driving force requirement

  ঘ

  Temperature sensitivity
• Falling film evaporators can be operated in _______________
  ক

  Counter-flow with the vapour

  খ

  Co-current flow with vapour

  গ

  Both co-current and counter-current

  ঘ

  Separate segments in any direction
• Falling film evaporators are a subclass of long tube evaporators.
  ক

  True

  খ

  False