Q.1
The boiling point of the solution ________ as we move to subsequent effects in a forward feed evaporator.
  • a) Decreases
  • b) Increases
  • c) Remains same
  • d) Oscillates
Q.2
The boiling point of the solution ________ as we move to subsequent effects in a backward feed evaporator.
  • a) Decreases
  • b) Increases
  • c) Remains same
  • d) Oscillates
Q.3
The boiling point of the solution ________ as we move to subsequent effects in a Mixed feed evaporator.
  • a) Decreases
  • b) Increases
  • c) Remains same
  • d) Oscillates
Q.4
The boiling point of the solution ________ as we move to subsequent effects in a parallel feed evaporator.
  • a) Decreases
  • b) Increases
  • c) Remains same
  • d) Is independent
Q.5
What is the possible solution to increase the evaporation rate in subsequent effects in forward feed evaporators?
  • a) Increasing pressure
  • b) Decreasing pressure
  • c) Increasing temperature
  • d) Decreasing temperature
Q.6
Forward feed evaporator use minimum energy of operation as the there is no requirement of pumps to carry the feed from effect to effect.
  • a) True
  • b) False
Q.7
Which one of the following evaporator uses maximum mechanical energy to operate?
  • a) Forward feed
  • b) Backward feed
  • c) Parallel feed
  • d) Mixed feed
Q.8
The pressure in backward feed evaporator also decreases along the feed direction to avoid excessive use of pumps.
  • b) False
  • a) True
Q.9
The concentration of the feed in parallel feed evaporator ____________ with subsequent effects if pressure decreases.
  • a) Should increase
  • b) Should decrease
  • c) Should be same
  • d) Cannot be inferred
Q.10
Which one of the following evaporator can work without pump?
  • a) Forward feed
  • b) Backward feed
  • c) Parallel feed
  • d) Mixed feed
Q.11
Backward feed evaporators are superior to forward feed in concentrating solutions to a higher extent! Why?
  • a) Because the highest concentration effect gets the highest pressure
  • b) Because the highest concentration gets the highest temperature
  • c) Because the highest concentration effect gets the lowest pressure
  • d) Because the highest concentration gets the lowest temperature
Q.12
How is the pressure application in different effects in a multiple effect evaporator decided?
  • a) Evaluating boiling point elevation by Duhring’s rule
  • b) Boiling point fall due to pressure drop by Arrhenius rule
  • c) Evaluating boiling point elevation by Kozeny Carman rule
  • d) Boiling point fall due to pressure drop by Sieder tate rule
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