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MCQs

Total Questions : 1628 | Page 22 of 163 pages
Question 211. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be
  1.    D
  2.    √d
  3.    √(2πd)
  4.    √(2d)
 Discuss Question
Answer: Option A. -> D
Question 212. Lap joints are preferred for plates having thickness __________ mm.
  1.    < 12.5
  2.    > 3
  3.    > 5
  4.    5-10
 Discuss Question
Answer: Option B. -> > 3
Question 213. Diameter of the seive tray column is determined by the
  1.    Lower limit of vapour velocity
  2.    Upper limit of the vapour velocity
  3.    Hole diameter of the seive tray
  4.    Height of the plate spacing
 Discuss Question
Answer: Option B. -> Upper limit of the vapour velocity
Question 214. __________ is the determining factor for the number of bubble caps to be used per tray.
  1.    Permissible slot velocity
  2.    Tray diameter
  3.    Liquid load
  4.    Vapor load
 Discuss Question
Answer: Option A. -> Permissible slot velocity
Question 215. Baffles may be eliminated for
  1.    Low viscosity liquids (< 200 poise)
  2.    High viscosity liquids (> 600 poise)
  3.    Large diameter tanks
  4.    None of these
 Discuss Question
Answer: Option B. -> High viscosity liquids (> 600 poise)
Question 216. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.
  1.    Increase by 1.8
  2.    Decrease by 22
  3.    Increase by 21.6
  4.    None of these
 Discuss Question
Answer: Option C. -> Increase by 21.6
Question 217. Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?
  1.    At the inner surface
  2.    At the mid thickness of the cylindrical wall
  3.    At the outer surface
  4.    None of these
 Discuss Question
Answer: Option A. -> At the inner surface
Question 218. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
  1.    Allowable gas velocity through the slots
  2.    Plate spacing
  3.    Diameter of the column
  4.    All of the above
 Discuss Question
Answer: Option A. -> Allowable gas velocity through the slots
Question 219. Le/D for a Tee (used as elbow, entering branch) would be
  1.    Less than that for Tee (used as elbow, entering run)
  2.    More than that for Tee (used as elbow, entering run)
  3.    Around 90
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 220. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m².°C.
  1.    1250
  2.    2500
  3.    7500
  4.    15000
 Discuss Question
Answer: Option C. -> 7500

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