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MCQs

Total Questions : 1628 | Page 2 of 163 pages
Question 11. 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
 Discuss Question
Answer: Option B. -> Smaller reactor should come first
Question 12. 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
 Discuss Question
Answer: Option D. -> All of the above
Question 13. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is
  1.    More
  2.    Less
  3.    Same
  4.    Cither A or B; depends upon the I.D. of the pipe
 Discuss Question
Answer: Option B. -> Less
Question 14. 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
 Discuss Question
Answer: Option C. -> Both A & B
Question 15. 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
 Discuss Question
Answer: Option C. -> Shortest centre to centre distance between adjacent tubes
Question 16. 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
 Discuss Question
Answer: Option C. -> 1/D⁵
Question 17. Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from
  1.    1.5-2.5
  2.    3.5-5.5
  3.    7.5-10.0
  4.    10-15
 Discuss Question
Answer: Option A. -> 1.5-2.5
Question 18. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
  1.    5-10
  2.    15-20
  3.    30-35
  4.    35-40
 Discuss Question
Answer: Option B. -> 15-20
Question 19. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to
  1.    5 cms
  2.    40% of the I.D. of the shell
  3.    25 cms
  4.    I.D. of the shell
 Discuss Question
Answer: Option A. -> 5 cms
Question 20. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
  1.    2 to 3
  2.    3 to 5
  3.    4 to 8
  4.    6 to 12
 Discuss Question
Answer: Option C. -> 4 to 8

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