Process Equipment and Plant Design

141. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

  1. Liquid gradient on the tray
  2. Lower skirt clearance
  3. Lower static submergence
  4. Small downcomer liquid seal

Correct answer: (A)
Liquid gradient on the tray

142. In case of 1.5" heat exchanger tubes, the inside flow area _________ with decrease in BWG.

  1. Increases
  2. Decreases
  3. Remains same
  4. None of these

Correct answer: (B)
Decreases

143. In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is

  1. < 10
  2. > 10
  3. > 20
  4. 30

Correct answer: (B)
> 10

144. In case of a continuous distillation column, increase in reflux ratio may result in the

  1. Lower fixed charges for the column
  2. Greater cost for the reboiler heat supply
  3. Greater cost for the condenser coolant
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

145. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of

  1. 1000
  2. 3000
  3. 5000
  4. 10000

Correct answer: (D)
10000

146. In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of _________ mm.

  1. 43954
  2. 44140
  3. 42217
  4. 43435

Correct answer: (B)
44140

147. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _________ cms.

  1. 10
  2. 20
  3. 30
  4. 35

Correct answer: (A)
10

148. In case of design of a shell and tube heat exchanger,

  1. Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
  2. Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
  3. O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
  4. All (A), (B) & (C)

Correct answer: (D)
All (A), (B) & (C)

149. In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ _________ cms.

  1. 1.2
  2. 0.5
  3. 3.8
  4. 6.8

Correct answer: (C)
3.8

150. In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed _________ of the column diameter.

  1. 1/5th
  2. 1/15th
  3. 1/30th
  4. 1/50th

Correct answer: (B)
1/15th

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