Question: In condenser, the cooling water is passed in the tube side in a pass arrangement, because
A.It reduces heat transfer area
B.More thinner tubes can be used
C.Pressure drop is reduced
D.It makes condenser compact
Answer: Option A

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Question 1. For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
  1.    Half
  2.    Twice
  3.    Thrice
  4.    Five times
Answer: Option C
Question 2. In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.
  1.    3-5
  2.    5-11
  3.    8-15
  4.    12-18
Answer: Option B
Question 3. Cooling water fouling factors vary in the range of 0.001 to 0.003
  1.    (BTU/hr.ft² . °F)⁻¹
  2.    (kcal/hr.m² .°C)⁻¹
  3.    (W/m².°K)⁻¹
  4.    (kcal/hr. m. °C)⁻¹
Answer: Option A
Question 4. The LMTD correction factor (FT) is applied in __________ heat exchangers.
  1.    1-1 cocurrent
  2.    Double pipe
  3.    All multipass
  4.    All of the above
Answer: Option C
Question 5. In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
  1.    1.1 to 1.5
  2.    1.6 to 2
  3.    2.2 to 2.6
  4.    2.7 to 3
Answer: Option A
Question 6. Back-trapping in a distillation column results due to
  1.    Low gas velocity
  2.    High gas velocity
  3.    Excessive liquid gradient over the tray
  4.    Low reflux ratio
Answer: Option C

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