Process Equipment and Plant Design

161. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

  1. D2
  2. D5
  3. D
  4. D9

Correct answer: (B)
D5

162. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a

  1. Clearance of 25-75 mm
  2. Cap pitch of 1.3-2 times the cap diameter
  3. Either 'a' or 'b'
  4. Neither 'a' nor 'b'

Correct answer: (C)
Either 'a' or 'b'

163. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

  1. Is always less than arithmetic average value
  2. Is always more than arithmetic mean value and the geometric mean value
  3. Is always less than arithmetic mean value, but more than geometric mean value
  4. May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

Correct answer: (A)
Is always less than arithmetic average value

164. In the design of a bag filter, the gas temperature is an important consideration, as it affects the

  1. Gas density
  2. Gas viscosity
  3. Fibre selection
  4. All (A), (B) & (C)

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

165. In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as

  1. 0.1
  2. 0.8
  3. 0.25
  4. 0.5

Correct answer: (B)
0.8

166. In the design of a shell and tube heat exchanger, the corrosion allowance

  1. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
  2. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
  3. For internal cover and tube sheet is provided on both the sides
  4. All (A), (B) & (C)

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

167. In the downcomer of a distillation column, the minimum recommended residence time is about _________ seconds.

  1. 2.5
  2. 5
  3. 12.5
  4. 17.5

Correct answer: (B)
5

168. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?

  1. Long tube vertical evaporator
  2. Short tube vertical evaporator
  3. Horizontal tube evaporator
  4. None of these

Correct answer: (C)
Horizontal tube evaporator

169. It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than

  1. 0.99
  2. 0.95
  3. 0.8
  4. 0.55

Correct answer: (C)
0.8

170. Joint efficiency (J) for a seamless pipe is

  1. 1
  2. 0.85
  3. 1.5
  4. < 0.5

Correct answer: (A)
1

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