Process Equipment and Plant Design

171. Lap joints are preferred for plates having thickness _________ mm.

  1. < 12.5
  2. > 3
  3. > 5
  4. 44109

Correct answer: (B)
> 3

172. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about _________ percent of the total thickness.

  1. 1 to 5
  2. 10 to 20
  3. 30 to 40
  4. 40 to 50

Correct answer: (B)
10 to 20

173. Larger depth of liquid on the trays of a distillation column

  1. Leads to high tray efficiency
  2. Results in higher pressure drop per tray
  3. Both (A) & (B)
  4. Neither (A) or (B)

Correct answer: (C)
Both (A) & (B)

174. Length to diameter ratio of most rotary driers is in the range of

  1. 1 to 2
  2. 4 to 10
  3. 10 to 20
  4. 20 to 30

Correct answer: (B)
4 to 10

175. Liquid gradient over a tray can be minimised by

  1. Providing a higher skirt clearance or a higher weir
  2. Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow
  3. Using split flow, radial flow or cascade flow for column diameter large than 4 ft
  4. All (A), (B) and (C)

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

176. Liquid gradient over the tray results due to the

  1. Resistance offered to flow of liquids by caps & risers and the flow of gas
  2. Low gas velocity
  3. Large plate spacing
  4. Large reflux ratio

Correct answer: (A)
Resistance offered to flow of liquids by caps & risers and the flow of gas

177. Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or _________ times the column diameter, whichever is lower.

  1. 2.5-3.0
  2. 5-7.5
  3. 10-12.5
  4. 15-20

Correct answer: (A)
2.5-3.0

178. Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than _________ kilolitres.

  1. 20
  2. 30
  3. 45
  4. 85

Correct answer: (C)
45

179. LMTD correction factor is used in heat exchanger design for

  1. Double pipe heat exchanger
  2. Multipass shell and tube heat exchanger
  3. Fouling fluids
  4. Counter flow of hot and cold fluids

Correct answer: (D)
Counter flow of hot and cold fluids

180. Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

  1. Less than arithmetic mean value
  2. More than arithmetic mean value
  3. More than geometric mean value
  4. Both (B) & (C)

Correct answer: (A)
Less than arithmetic mean value

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