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MCQs

Total Questions : 1628 | Page 19 of 163 pages
Question 181. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.
  1.    1/10-1/15th
  2.    1/5-1/10th
  3.    1/20-1/30th
  4.    1/2 to 1/4th
 Discuss Question
Answer: Option A. -> 1/10-1/15th
Question 182. The equivalent diameter for pressure drop is __________ that for heat transfer.
  1.    Smaller than
  2.    Greater than
  3.    Equal to
  4.    Not related with
 Discuss Question
Answer: Option D. -> Not related with
Question 183. In a shell and tube heat exchanger, tube side __________ of the mass velocity.
  1.    Heat transfer co-efficient is proportional to 0.8th power
  2.    Pressure drop is proportional to the square
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 184. Baffle spacing is generally __________ the I.D. of the shell.
  1.    More than
  2.    Not greater than
  3.    Not less than one fifth of
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 185. In case of 1.5" heat exchanger tubes, the inside flow area __________ with decrease in BWG.
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    None of these
 Discuss Question
Answer: Option B. -> Decreases
Question 186. The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.
  1.    0.6-0.8 times
  2.    Equal to
  3.    Twice
  4.    2 ft irrespective of (for column > 3 ft diameter)
 Discuss Question
Answer: Option A. -> 0.6-0.8 times
Question 187. Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)
  1.    Η = 17 - 61.1 log μ
  2.    Η = 24.6 (Δp/μ)
  3.    Η = 1.66 - 0.25 log μ
  4.    Η = 0.25 log μ - 1.67
 Discuss Question
Answer: Option A. -> Η = 17 - 61.1 log μ
Question 188. The absorption factor is defined as (where, S₁ = slope of the equilibrium curve, S₂ = slope of the operating line)
  1.    S₁/S₂
  2.    S₁.S₂
  3.    S₂/S₁
  4.    1/S₁.S₂
 Discuss Question
Answer: Option A. -> S₁/S₂
Question 189. A cylindrical storage tank can have a self supported conical roof,
  1.    If its diameter is less than 15-20metres
  2.    If its diameter is more than 50 meters
  3.    If the thickness of the roof is more than that of the cylindrical shell
  4.    Irrespective of its diameter
 Discuss Question
Answer: Option A. -> If its diameter is less than 15-20metres
Question 190. A stuffing box is used for
  1.    Absorbing the contraction/expansion of pipeline due to temperature changes
  2.    Prevention of fluid leakage around moving parts
  3.    Facilitating smooth opening and closing of a valve
  4.    Reducing the resistance of fluid flow
 Discuss Question
Answer: Option B. -> Prevention of fluid leakage around moving parts

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