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MCQs

Total Questions : 1628 | Page 162 of 163 pages
Question 1611. 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.    7.5-10.0
  2.    3.5-5.5
  3.    44119
  4.    1.5-2.5
 Discuss Question
Answer: Option D. -> 1.5-2.5
Question 1612. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
  1.    4 to 8
  2.    6 to 12
  3.    2 to 3
  4.    3 to 5
 Discuss Question
Answer: Option A. -> 4 to 8
Question 1613. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").
  1.    Equal to
  2.    1.5 times
  3.    Three fourth
  4.    Half
 Discuss Question
Answer: Option A. -> Equal to
Question 1614. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
  1.    30-35
  2.    15-20
  3.    43961
  4.    35-40
 Discuss Question
Answer: Option B. -> 15-20
Question 1615. 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 1616. Two iron pipes of the same nominal diameter but different schedule numbers will have the same
  1.    None of these
  2.    Wall thickness
  3.    Outside diameter
  4.    Inside diameter
 Discuss Question
Answer: Option D. -> Inside diameter
Question 1617. Pick out the wrong statement about the design of seive plate column and the bubble cap column.
  1.    The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
  2.    Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
  3.    Weir length for a bubble cap plate is the same as that for the seive plate
  4.    Weir height for a bubble cap plate column is the same as that for a seive plate column
 Discuss Question
Answer: Option D. -> Weir height for a bubble cap plate column is the same as that for a seive plate column
Question 1618. __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
  1.    Cross flow
  2.    Cascade
  3.    Split flow
  4.    Radial flow
 Discuss Question
Answer: Option A. -> Cross flow
Question 1619. Le/D for fully open gate valves would be
  1.    Much less (say 2% than that for fully open globe valves)
  2.    Around 7
  3.    Both B and C
  4.    Much more than that for fully open globe valves
 Discuss Question
Answer: Option C. -> Both B and C
Question 1620. Hole diameter of the seive trays in the distillation column ranges from __________ mm.
  1.    12.5 to 18.5
  2.    4 to 8
  3.    L to 3
  4.    3 to 12.5
 Discuss Question
Answer: Option D. -> 3 to 12.5

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