Process Equipment and Plant Design

351. Which of the following is used to set the diameter of the distillation column?

  1. Number of theoretical plates
  2. Static submergence
  3. Allowable vapour velocity
  4. Length of straight rectangular weir on cross-flow tray

Correct answer: (C)
Allowable vapour velocity

352. Which of the following lengths of heat exchanger tubes are normally not used in practice?

  1. 2.5 metres
  2. 6 metres
  3. 10 metres
  4. 0.5 metre

Correct answer: (C)
10 metres

353. Which of the following material is seldom used for pressure vessel construction?

  1. Rimmed still
  2. Mild steel
  3. Killed steel
  4. Semi-killed steel

Correct answer: (A)
Rimmed still

354. Which of the following packing materials provides for maximum mass transfer?

  1. Raschig rings
  2. Raschig rings
  3. Cross-partition rings
  4. All give the same value

Correct answer: (C)
Cross-partition rings

355. Which of the following types of reactors is the safest from operation point of view?

  1. A vapor phase reactor
  2. Pot type reactor
  3. A liquid phase reactor
  4. A liquid phase catalytic reactor

Correct answer: (A)
A vapor phase reactor

356. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

  1. Triangular pitch
  2. Square pitch
  3. Diagonal square pitch
  4. Heat transfer rate is independent of tube arrangement

Correct answer: (A)
Triangular pitch

357. Width and depth of grooves in the tube sheet holes normally are _________ inch respectively.

  1. 1/8 and 1/64
  2. 1/64 and 1/8
  3. 1/2 and 8
  4. 1/2 and 5

Correct answer: (A)
1/8 and 1/64

358. Wind load consideration in the design of a support can be neglected, when the vessel is

  1. Tall (say 30 metres), but is full of liquid
  2. Tall but empty
  3. Short ( < 2 m) and housed indoor
  4. None of these

Correct answer: (C)
Short ( < 2 m) and housed indoor

359. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter

  1. Increases
  2. Decreases
  3. Remain unaffected
  4. None of these

Correct answer: (B)
Decreases

360. With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

  1. Increase
  2. Decrease
  3. Remain unaffected
  4. Increase or decrease depending on the nature of the dust

Correct answer: (A)
Increase

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