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MCQs

Total Questions : 2525 | Page 247 of 253 pages
Question 2461. A 2-4 heat exchanger involves__________________?
  1.    Only counter-flow of fluids
  2.    Only parallel-flow of fluids
  3.    Both counter and parallel-flow of the fluids
  4.    Smaller pressure drop compared to 1-2 exchanger
 Discuss Question
Answer: Option C. -> Both counter and parallel-flow of the fluids
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2462. JH factor for heat transfer is not a function of the _______________ number?
  1.    Reynolds
  2.    Nusselt
  3.    Grashoff
  4.    Both B. & C.
 Discuss Question
Answer: Option D. -> Both B. & C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2463. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
  1.    √d
  2.    d
  3.    d2
  4.    d1.5
 Discuss Question
Answer: Option C. -> d2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2464. Boiling point elevation of a solution of NaOH _____________________?
  1.    Increases rapidly with temperature rise
  2.    Is almost independent of temperature
  3.    Is almost independent of pressure
  4.    Both B. and C
 Discuss Question
Answer: Option D. -> Both B. and C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2465. Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
  1.    0.5
  2.    1
  3.    > 2
  4.    1.5
 Discuss Question
Answer: Option B. -> 1
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2466. Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?
  1.    Thin walled having the value of Ao Ai/< 2
  2.    Thick walled
  3.    Having the value of Ao/Ai > 2
  4.    Both B. and C.
 Discuss Question
Answer: Option A. -> Thin walled having the value of Ao Ai/< 2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2467. Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?
  1.    Maximum resistance in the series
  2.    Sum of all resistances
  3.    Average of all resistances
  4.    Minimum resistance presents in the series
 Discuss Question
Answer: Option B. -> Sum of all resistances
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2468. The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?
  1.    Stefan-Boltzmann’s
  2.    Planck’s
  3.    Wien’s displacement
  4.    None of these
 Discuss Question
Answer: Option C. -> Wien’s displacement
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2469. A diathermanous substance _______________ the thermal radiation completely?
  1.    Absorbs
  2.    Reflects
  3.    Transmits
  4.    None of these
 Discuss Question
Answer: Option C. -> Transmits
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2470. In which mode of heat transfer, the Biot number is important ?
  1.    Transient heat conduction
  2.    Natural convection
  3.    Forced convection
  4.    Radiation
 Discuss Question
Answer: Option A. -> Transient heat conduction
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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