Capacity and Economy of Multiple Effect Evaporators MCQ

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• What is the mass balance in complete setup in this backward feed evaporator?
  ক

  F=P1+E1

  খ

  P3=P1+S1

  গ

  F=P3+E1

  ঘ

  F=P1+E3
• What is the Evaporator economy of the 1st effect if we evaporate 10kg/hr of water from a feed of 50kg/hr at a temperature of 25oC to a final temperature of 100oC in an hour in a triple effect forward feed evaporator which has steam supply of 25kg/hr? Given the concentration changes from a value of 0.3 to 0.55 in the 1st effect of the setup. Latent heat of vaporization of water = 2,260 kJ/kg Specific heat capacity = 6 KJ/Kg K
  ক

  95%

  খ

  91%

  গ

  68%

  ঘ

  33%
• We have a triple effect evaporator which has steam supply of 5kg/hr, the setup is a forward pass setup, the feed enters the 1st setup at 10kg/hr of 50% concentration and leaves the final effect at 75% concentration. What is the economy of this setup?
  ক

  65%

  খ

  66%

  গ

  68%

  ঘ

  33%
• Which type of feeding is supposed to give maximum economy to a particular consumption?
  ক

  Forward feed

  খ

  Backward feed

  গ

  Parallel feed

  ঘ

  Mixed feed
• The formula for the economy of the evaporator does not depend on the type of feeding.
  ক

  True

  খ

  False
• Carry out the mass balance on the 1st effect of the following setup.
  ক

  P3 = P1+E1

  খ

  P3 = P1+S1

  গ

  P1 = P3+E1

  ঘ

  P = P1+E1
• We have a triple effect evaporator which has steam supply of 5kg/hr, the setup is a forward pass setup, feed enters the 1st setup at 10kg/hr of 50% concentration and leaves the final effect at 75% concentration. What is the product discharged from this setup?
  ক

  6.67kg/hr

  খ

  3.33kg/hr

  গ

  10kg/hr

  ঘ

  11kg/hr
• We have a triple effect evaporator which has steam supply of 5kg/hr, the setup is a forward pass setup, feed enters the 1st setup at 10kg/hr of 50% concentration and leaves the final effect at 75% concentration. What is the evaporate discharged if the total evaporate from 1st and 2nd effect are 2kg/hr and 1kg/hr respectively?
  ক

  6.67 kg/hr

  খ

  3.33 kg/hr

  গ

  0.36 kg/hr

  ঘ

  0.33 kg/hr
• What is the economy of the 3rd effect in the following mixed feed evaporator?
  ক

  ∈ = S/(E1+E2+E3)

  খ

  ∈ = E1/(E1+E2+E3)

  গ

  ∈ = E3/E2

  ঘ

  ∈ = E2/E1
• What is the economy of the given Forward feed evaporator?
  ক

  ∈ = S /(E1+E2+E3)

  খ

  ∈ = E1/(E1+E2+E3)

  গ

  ∈ = E3/E2

  ঘ

  ∈ = E2/E1
• In the given setup, what is the capacity of the 2nd effect of this parallel feed evaporator?
  ক

  E1 + E2 + E3

  খ

  E3

  গ

  E2

  ঘ

  E1 + E2
• In the given setup, what is the capacity of this forward feed evaporator?
  ক

  E1 + E2 + E3

  খ

  E3

  গ

  E1

  ঘ

  E1 + E2