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MCQs

Total Questions : 2525 | Page 4 of 253 pages
Question 31. Economy of a multiple effect evaporator depends upon the
  1.    Heat balance consideration
  2.    Rate of heat transfer
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Heat balance consideration
Question 32. In a forward feed multiple effect evaporator, the pressure is
  1.    Highest in last effect
  2.    Lowest in last effect
  3.    Same in all effects
  4.    Dependent on the number of effects
 Discuss Question
Answer: Option B. -> Lowest in last effect
Question 33. Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is
  1.    IR
  2.    I²R
  3.    IR²
  4.    I²R²
 Discuss Question
Answer: Option B. -> I²R
Question 34. In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
  1.    Geometric
  2.    Arithmetic
  3.    Logarithmic
  4.    Either A, B or C
 Discuss Question
Answer: Option C. -> Logarithmic
Question 35. The most conducive surface for dropwise condensation to occur is the __________ surface.
  1.    Coated
  2.    Oily
  3.    Glazed & polished
  4.    Smooth
 Discuss Question
Answer: Option B. -> Oily
Question 36. The non-dimensional temperature gradient in a liquid at the wall of a pipe is the
  1.    Heat flux
  2.    Nusselt number
  3.    Prandtl number
  4.    Schmidt number
 Discuss Question
Answer: Option A. -> Heat flux
Question 37. Correction is applied to LMTD for __________ flow.
  1.    Parallel
  2.    Counter
  3.    Cross
  4.    None of these
 Discuss Question
Answer: Option C. -> Cross
Question 38. Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?
  1.    Square pitch
  2.    Triangular pitch
  3.    Diagonal square pitch
  4.    None of these
 Discuss Question
Answer: Option B. -> Triangular pitch
Question 39. The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.
  1.    0.38-0.78
  2.    0.5-50
  3.    100-1000
  4.    5-50
 Discuss Question
Answer: Option B. -> 0.5-50
Question 40. A black body does not __________ radiation.
  1.    Absorb or emit
  2.    Refract
  3.    Reflect
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C

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