Process Equipment and Plant Design

191. Minimum tube pitch recommended for shell and tube heat exchangers is about _________ times the outside diameter of the tube.

  1. 1.25
  2. 1.75
  3. 2.5
  4. 3.5

Correct answer: (A)
1.25

192. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder

  1. Has greater structural strength
  2. Is easy to fabricate
  3. Both (A) and (B)
  4. Neither (A) nor (B)

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

193. Movement of pipeline caused by thermal expansion is taken care by providing

  1. Expansion joint
  2. Changes in its direction
  3. Change in the shape of pipeline
  4. All (A), (B) and (C)

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

194. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of _________ times the paddle diameter.

  1. 0.1 to 0.25
  2. 0.3 to 0.5
  3. 0.5 to 0.6
  4. 0.65 to 0.80

Correct answer: (A)
0.1 to 0.25

195. Needle valves are generally not used for

  1. Very large diameter pipes
  2. High pressure throttling service
  3. Very accurate flow control
  4. Smaller sizes of pipe

Correct answer: (A)
Very large diameter pipes

196. Nominal size of a pipe is an indication of its _________ diameter.

  1. Inner
  2. Outer
  3. Approximate
  4. None of these

Correct answer: (C)
Approximate

197. Normal screwed fittings are used for pipes upto a diameter of _________ inches.

  1. 1.5
  2. 3
  3. 5
  4. 9

Correct answer: (B)
3

198. Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from

  1. 1.5-2.5
  2. 3.5-5.5
  3. 7.5-10.0
  4. 42278

Correct answer: (A)
1.5-2.5

199. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

  1. More
  2. Less
  3. Same
  4. More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

Correct answer: (B)
Less

200. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

  1. 0.4-0.6
  2. 0.35-0.75
  3. 0.1-0.2
  4. 0.55-0.85

Correct answer: (C)
0.1-0.2

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