Process Equipment and Plant Design

111. If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of

  1. D/2 or minimum 2" to 5D
  2. D/5 or minimum 2" to 5D
  3. D/5 or minimum 2" to D
  4. None of these

Correct answer: (B)
D/5 or minimum 2" to 5D

112. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _________ times.

  1. Increase by 1.8
  2. Decrease by 22
  3. Increase by 21.6
  4. None of these

Correct answer: (C)
Increase by 21.6

113. In a _________ riveted joint, the number of rivets decreases from the innermost row to the outermost row.

  1. Chain
  2. Diamond
  3. Zig-zag
  4. None of these

Correct answer: (B)
Diamond

114. In a _________ riveted joint, the rivets in the various rows are opposite to each other.

  1. Zig-zag
  2. Chain
  3. Diamond
  4. None of these

Correct answer: (B)
Chain

115. In a bag filter, the pressure drop increases directly as the

  1. Density of the gas, but is independent of the viscosity of the gas
  2. Density of the gas and inversely as viscosity of the gas
  3. Viscosity of the gas and inversely as density of the gas
  4. None of these

Correct answer: (B)
Density of the gas and inversely as viscosity of the gas

116. In a continuous distillation column, the optimum reflux ratio ranges from _________ times the minimum reflux ratio.

  1. 1.1 to 1.5
  2. 1.6 to 2
  3. 2.2 to 2.6
  4. 2.7 to 3

Correct answer: (A)
1.1 to 1.5

117. In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by

  1. ζh = 2 ζL
  2. ζh = ζL
  3. ζh = ζL/2
  4. No relation exists

Correct answer: (A)
ζh = 2 ζL

118. In a distillation column, bubble caps are located on trays with a pitch of _________ times the outside diameter of the caps.

  1. 1.3 to 2
  2. 1.6 to 2
  3. 2.5
  4. 1.5 to 3

Correct answer: (A)
1.3 to 2

119. In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is _________ cms.

  1. 2.5
  2. 7.5
  3. 15
  4. 20

Correct answer: (B)
7.5

120. In a distillation column, the minimum residence time for liquid in the downspout is about _________ seconds.

  1. 1
  2. 8
  3. 80
  4. 180

Correct answer: (B)
8

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