Heat Transfer MCQs with answers Page - 8

Here, you will find a collection of MCQ questions on Heat Transfer. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Admin • 802.91K Points
Coach

Q. At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

  • (A) Buffer zone
  • (B) Turbulent core
  • (C) Both A and B
  • (D) Viscous sub-layer

A

Admin • 802.91K Points
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Q. When vaporisation takes place directly at the heating surface, it is called

  • (A) Film boiling
  • (B) Nucleate boiling
  • (C) Vapour binding
  • (D) None of these

A

Admin • 802.91K Points
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Q. Which is the most suitable for the con-certration of highly concentrated solution?

  • (A) Open pan evaporation
  • (B) Long tube vertical evaporator
  • (C) Agitated film evaporator
  • (D) None of these

A

Admin • 802.91K Points
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Q. View factor is important in heat transfer by

  • (A) Steady state conduction
  • (B) Natural convection
  • (C) Forced convection
  • (D) Radiation

A

Admin • 802.91K Points
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Q. Thermal diffusivity is the most important in heat transfer by

  • (A) Conduction
  • (B) Radiation
  • (C) Condensation
  • (D) Natural convection

A

Admin • 802.91K Points
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Q. Tube expansion allowances exist in __________ heat exchanger.

  • (A) Multipass fixed tube sheet
  • (B) U-tube
  • (C) Single pass fixed tube sheet
  • (D) None of these

A

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Q. In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)

  • (A) D/5 and D
  • (B) D/2 and 2D
  • (C) D/4 and 2D
  • (D) D and 2D

A

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Q. Mode of heat transfer involved in the cooling of air cooled internal combustion engine is

  • (A) Conduction
  • (B) Natural convection
  • (C) Forced convection
  • (D) None of these

A

Admin • 802.91K Points
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Q. The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are

  • (A) (COP)R = (COP)HP = 0.6
  • (B) (COP)R = 2.5; (COP)HP = 1.5
  • (C) (COP)R = 1.5; (COP)HP = 2.5
  • (D) (COP)R = (COP)HP = 2.5

A

Admin • 802.91K Points
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Q. Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

  • (A) Maximum resistance in the series
  • (B) Sum of all resistances
  • (C) Average of all resistances
  • (D) Minimum resistance presents in the series

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