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MCQs

Total Questions : 2525 | Page 27 of 253 pages
Question 261. Grashhoff number is given by
  1.    gD³.β.Δtρ²/μ²
  2.    gD2βΔtρ/μ²
  3.    gD2βΔtP²μ
  4.    gD³βΔtP²/μ
 Discuss Question
Answer: Option A. -> gD³.β.Δtρ²/μ²
Question 262. In a shell and tube heat exchanger, square pitch compared to triangular pitch
  1.    Gives a higher shell side pressure drop
  2.    Gives a lower shell side pressure drop
  3.    Can pack more surface area into a shell of given diameter
  4.    None of these
 Discuss Question
Answer: Option A. -> Gives a higher shell side pressure drop
Question 263. Air is best heated with steam in a heat exchanger of
  1.    Plate type
  2.    Double pipe type with fin on steam side
  3.    Double pipe type with fin on air side
  4.    Shell and tube type
 Discuss Question
Answer: Option C. -> Double pipe type with fin on air side
Question 264. Use of transverse baffles in a shell and tube heat exchanger is done to increase the
  1.    Rate of heat transfer
  2.    Flow velocity
  3.    Turbulence of shell side fluid
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 265. An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is
  1.    4000
  2.    9000
  3.    4600
  4.    3000
 Discuss Question
Answer: Option A. -> 4000
Question 266. Heat exchanger tubes are never made of
  1.    Plain carbon steel
  2.    Stainless steel
  3.    Lead
  4.    Copper
 Discuss Question
Answer: Option C. -> Lead
Question 267. Which of the following has the minimum absorptivity?
  1.    Aluminium foil
  2.    Coal dust
  3.    Refractory bricks
  4.    Iron plates
 Discuss Question
Answer: Option A. -> Aluminium foil
Question 268. The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.
  1.    Greater than
  2.    Lower than
  3.    Is same as
  4.    Half
 Discuss Question
Answer: Option B. -> Lower than
Question 269. The driving potential for the crystal growth during crystallisation is the __________ of the solution.
  1.    Concentration
  2.    Viscosity
  3.    Super-saturation
  4.    Density
 Discuss Question
Answer: Option C. -> Super-saturation
Question 270. For what value of Prandtl number, the Col-burn analogy is valid?
  1.    0.06 to 120
  2.    0.6 to 120
  3.    1 to 103
  4.    L to 50
 Discuss Question
Answer: Option B. -> 0.6 to 120

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