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MCQs

Total Questions : 2525 | Page 5 of 253 pages
Question 41. JH factor for heat transfer depends upon the __________ number.
  1.    Biot
  2.    Nusselt
  3.    Reynolds
  4.    Prandtl
 Discuss Question
Answer: Option C. -> Reynolds
Question 42. The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is
  1.    Nusselt number
  2.    Sherwood number
  3.    Schmidt number
  4.    Stanton number
 Discuss Question
Answer: Option C. -> Schmidt number
Question 43. With increase in porosity, the thermal conductivity of a solid substance
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    May increase or decrease; depends on the solid
 Discuss Question
Answer: Option B. -> Decreases
Question 44. 'Duhring's plot' is of use in
  1.    Extractive distillation
  2.    Evaporation
  3.    Leaching
  4.    Absorption
 Discuss Question
Answer: Option B. -> Evaporation
Question 45. Heat exchangers operating, when the asymptotic range is reached,
  1.    Provide very large heat transfer co-efficient
  2.    Results in making part of the heating surface inactive
  3.    Results in abruptly increased velocity
  4.    None of these
 Discuss Question
Answer: Option B. -> Results in making part of the heating surface inactive
Question 46. In natural convection heat transfer, the correlating parameter is the
  1.    Graetz number
  2.    Eckert number
  3.    Grashoff number
  4.    Bond number
 Discuss Question
Answer: Option C. -> Grashoff number
Question 47. Stefen's block body radiation law can also be derived from __________ law.
  1.    Kirchoffs
  2.    Planck's
  3.    Fourier's
  4.    None of these
 Discuss Question
Answer: Option B. -> Planck's
Question 48. Pick out the wrong statement.
  1.    Orifice baffles are never used in a shell and tube heat exchanger
  2.    Pressure drop on the shell side of a heat exchanger depends upon tube pitch also
  3.    In a horizontal tube evaporator, surface blanketing by air is avoided
  4.    Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers
 Discuss Question
Answer: Option A. -> Orifice baffles are never used in a shell and tube heat exchanger
Question 49. What is the emissivity of a black body?
  1.    1
  2.    0
  3.    0.90
  4.    0.5
 Discuss Question
Answer: Option A. -> 1
Question 50. Unsteady state heat conduction occurs, when
  1.    Temperature distribution is independent of time
  2.    Temperature distribution is dependent on time
  3.    Heat flows in one direction only
  4.    Three dimensional heat flow is concerned
 Discuss Question
Answer: Option B. -> Temperature distribution is dependent on time

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