Lakshya Education MCQs

Question: Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is
D.Cither A or B; depends upon the I.D. of the pipe
Answer: Option B

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Question 1. Larger depth of liquid on the trays of a distillation column
  1.    Leads to high tray efficiency
  2.    Results in higher pressure drop per tray
  3.    Both A & B
  4.    Neither A nor B
Answer: Option C
Question 2. In a shell and tube heat exchanger, the 'tube pitch' is defined as the
  1.    O.D. of the tube for square pitch
  2.    Shortest distance between two adj acent tube holes
  3.    Shortest centre to centre distance between adjacent tubes
  4.    None of these
Answer: Option C
Question 3. For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
  1.    1/D
  2.    1/D²
  3.    1/D⁵
  4.    D²
Answer: Option C
Question 4. 1.2 to 3.8 cms is the value of the
  1.    Downcomer liquid seal in case of a balanced tray design
  2.    Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.)
  3.    Skirt clearance for bubble caps
  4.    All of the above
Answer: Option D
Question 5. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
  1.    Equal sized reactors are the best
  2.    Smaller reactor should come first
  3.    Larger reactor should come first
  4.    None of these
Answer: Option B
Question 6. In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
  1.    nth
  2.    (1/n)th
  3.    0.5 nth
  4.    1.5 nth
Answer: Option B

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