Process Equipment and Plant Design

151. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

  1. Aa = Sa
  2. 1.2 Aa = 1.2 Sa
  3. Sa = 1.5 Aa
  4. Aa = 1.5 Sa

Correct answer: (A)
Aa = Sa

152. In condenser, the cooling water is passed in the tube side in a pass arrangement, because

  1. It reduces heat transfer area
  2. More thinner tubes can be used
  3. Pressure drop is reduced
  4. It makes condenser compact

Correct answer: (A)
It reduces heat transfer area

153. In distillation columns, bubble caps are held in place over trays by

  1. Rivets
  2. A hold down bar
  3. Bolts
  4. Both (B) and (C)

Correct answer: (D)
Both (B) and (C)

154. In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around

  1. 0.5
  2. 1.5
  3. 2.5
  4. 3.5

Correct answer: (B)
1.5

155. In most of the shell and tube heat exchangers, the tube pitch is generally _________ the tube diameter.

  1. Less than
  2. 1.25-1.50 times
  3. 2.5 times
  4. one-fourth of

Correct answer: (B)
1.25-1.50 times

156. In packed absorption tower, onset of flooding usually occurs at a pressure drop of about _________ mm of water column per metre height of packing.

  1. 25-50
  2. 50-75
  3. 200-250
  4. 750-1000

Correct answer: (B)
50-75

157. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _________ of the column diameter.

  1. 1/10-1/15th
  2. 1/5-1/10th
  3. 1/20-1/30th
  4. 1/2 to 1/4th

Correct answer: (A)
1/10-1/15th

158. In packed towers provided with saddle packing, liquid redistributors are positioned at every _________ times column diameter or 6 metres whichever is less.

  1. 43892
  2. 44048
  3. 42278
  4. 20-25

Correct answer: (B)
44048

159. In shell and tube heat exchangers, straight tie rods are used to

  1. Hold baffle in space
  2. Fix the tubes in position
  3. Account for thermal strain
  4. None of these

Correct answer: (A)
Hold baffle in space

160. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally _________ times the hole diameter to give the required hole area.

  1. 0.5 to 1.5
  2. 2.5 to 4.0
  3. 5 to 10
  4. 10 to 15

Correct answer: (B)
2.5 to 4.0

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