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MCQs

Total Questions : 1628 | Page 23 of 163 pages
Question 221. Bubble cap plate column is
  1.    A finite stage contactor
  2.    Used only for distillation, not for absorption
  3.    A differential stage contactor
  4.    A continuous contactor
 Discuss Question
Answer: Option A. -> A finite stage contactor
Question 222. In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
  1.    2.5
  2.    7.5
  3.    15
  4.    20
 Discuss Question
Answer: Option B. -> 7.5
Question 223. The thermal stress in a metallic bar does not depend upon the
  1.    Changes in temperature
  2.    Cross-sectional area
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Cross-sectional area
Question 224. Maximum allowable vapour velocity in a bubble cap tower is determined by the
  1.    Entrainment considerations
  2.    Vapour density
  3.    Diameter of the column
  4.    None of these
 Discuss Question
Answer: Option A. -> Entrainment considerations
Question 225. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
  1.    Liquid gradient on the tray
  2.    Lower skirt clearance
  3.    Lower static submergence
  4.    Small downcomer liquid seal
 Discuss Question
Answer: Option A. -> Liquid gradient on the tray
Question 226. A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
  1.    45
  2.    60
  3.    80
  4.    95
 Discuss Question
Answer: Option C. -> 80
Question 227. A pipe is generally made of circular cross-section, because a circular cross-section has the
  1.    Higher structural strength
  2.    Lowest surface area requirement for a given volume
  3.    Both A & B
  4.    None of these
 Discuss Question
Answer: Option C. -> Both A & B
Question 228. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell
  1.    Decreases upwards
  2.    Increases upwards
  3.    Remains same throughout
  4.    May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
 Discuss Question
Answer: Option A. -> Decreases upwards
Question 229. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise.
  1.    300
  2.    600
  3.    1000
  4.    1500
 Discuss Question
Answer: Option B. -> 600
Question 230. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
  1.    0
  2.    ∞
  3.    > 1
  4.    < 1
 Discuss Question
Answer: Option B. -> ∞

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