Process Equipment and Plant Design

331. Value of Peclet number = ∞, is the representative of

  1. Laminar flow
  2. Complete back mixing
  3. Plug flow
  4. Eddy diffusivity = 0

Correct answer: (C)
Plug flow

332. Value of Peclet number = 0, is the representative of

  1. Laminar flow
  2. Complete back mixing
  3. Plug flow
  4. Eddy diffusivity = 0

Correct answer: (B)
Complete back mixing

333. Vapor velocity in a distillation column for non-foaming mixture is in the range of _________ times the flooding velocity.

  1. 0.1 to 0.3
  2. 0.6 to 0.7
  3. 0.85 to 0.95
  4. 1.5 to 2

Correct answer: (B)
0.6 to 0.7

334. Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

  1. Hydrostatic head is required for refluxing the condensate
  2. Only the function of condensation is to be carried out
  3. Sub-cooling of condensate is desired
  4. Both the functions of condensation & sub cooling are carried out in a single unit

Correct answer: (D)
Both the functions of condensation & sub cooling are carried out in a single unit

335. Vertical vessels are not supported by

  1. Brackets
  2. Skirts
  3. Columns
  4. Saddles

Correct answer: (D)
Saddles

336. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

  1. More
  2. Less
  3. Same
  4. Either (A) or (B); depends upon the I.D. of the pipe

Correct answer: (B)
Less

337. Weep holes provided in the plates of a distillation column

  1. Facilitate draining out liquid from a tray when the unit is not in operation
  2. Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
  3. Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
  4. All (A), (B) and (C)

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

338. Welded joint efficiency in the design of chemical process equipment is taken as

  1. 0.55
  2. 0.75
  3. 0.85
  4. 0.95

Correct answer: (C)
0.85

339. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?

  1. 6.5 cms
  2. 6.5 mm
  3. Equal to tube I.D
  4. Equal to tube O.D

Correct answer: (B)
6.5 mm

340. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?

  1. 0
  2. ∞
  3. > 1
  4. < 1

Correct answer: (B)
∞

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