Process Equipment and Plant Design

51. Baffle width is normally taken as _________ times the tank diameter.

  1. 0.1-0.12
  2. 0.4-0.5
  3. 0.45-0.6
  4. 0.2-0.45

Correct answer: (A)
0.1-0.12

52. Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

  1. Segmental baffle
  2. Flat plate extending across the wall
  3. Disk type baffle
  4. Helical type baffle

Correct answer: (B)
Flat plate extending across the wall

53. Baffles may be eliminated for

  1. Low viscosity liquids ( < 200 poise)
  2. High viscosity liquids ( > 600 poise)
  3. Large diameter tanks
  4. None of these

Correct answer: (B)
High viscosity liquids ( > 600 poise)

54. Brass valves are usually made for pipe sizes _________ inches.

  1. ≤ 1
  2. ≤ 2
  3. > 2.5
  4. > 3.5

Correct answer: (B)
≤ 2

55. Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about _________ mm.

  1. 10
  2. 50
  3. 100
  4. 200

Correct answer: (C)
100

56. Bubble cap plate column is

  1. A finite stage contactor
  2. Used only for distillation, not for absorption
  3. A differential stage contactor
  4. A continuous contactor

Correct answer: (A)
A finite stage contactor

57. Bubble cap tray is the most commonly used tray in large distillation column, because

  1. Of its flexibility and nearly constant efficiency under varying conditions of operation
  2. It incurs less pressure drop as compared to any other try designed for the same duty
  3. It eliminates the foaming and entrainment tendency during operation
  4. None of these

Correct answer: (A)
Of its flexibility and nearly constant efficiency under varying conditions of operation

58. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _________ the longitudinal stress.

  1. Half
  2. Equal to
  3. Twice
  4. Eight times

Correct answer: (C)
Twice

59. Column support for the roof of cylindrical storage tank must be provided for

  1. Small diameter tanks
  2. Large diameter tanks
  3. Small diameter tall tanks
  4. All tanks irrespective of their heights and diameters

Correct answer: (B)
Large diameter tanks

60. Commercial packed scrubbers are normally designed for a pressure drop range of _________ mm water column per metre of packed height.

  1. 44047
  2. 17-34
  3. 52-68
  4. 88-105

Correct answer: (B)
17-34

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