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Chemical Engineering

Heat Transfer MCQs

Practice Heat Transfer MCQs for competitive exams.

Heat Transfer MCQs

Practice questions from this topic.

The Graetz number is concerned with the

  1. A. Mass transfer between a gas and a liquid
  2. B. Absorption with chemical reaction
  3. C. Heat transfer in turbulent flow
  4. D. Heat transfer in laminar flow
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While the total emissivity of a perfect black body is unity, the same for a real body is

  1. A. 0
  2. B. 1
  3. C. > 1
  4. D. Between 0 and 1
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Which of the following situations can be approximated to a steady state heat transfer system?

  1. A. A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C
  2. B. 10 kg of dry saturated steam at 8 kgf/cm 2 flowing through a short length of stainless-steel pipe exposed to atmospheric air at 35°C
  3. C. Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C
  4. D. A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C
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Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?

  1. A. Dittus-Boeltier equation
  2. B. Sieder-Tate equation
  3. C. Nusselt equation
  4. D. None of these
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Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

  1. A. 1
  2. B. 7
  3. C. 18
  4. D. 26
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Vibrations in the tubes of a shell and tube heat exchanger is induced due to the

  1. A. Flow of fluid on the tube and shell sides
  2. B. Oscillations in the flow of shell/tube sides fluid
  3. C. Vibrations transmitted through piping and/or supports due to external reasons
  4. D. All of the above
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If heat transfer rate varies with the time, it is termed as

  1. A. Forced convection
  2. B. Steady state conduction
  3. C. Monochromatic radiation
  4. D. None of these
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Which one gives the monochromatic emissive power for black body radiation?

  1. A. Planck's law
  2. B. Kirchhoffs law
  3. C. Wien's law
  4. D. Stefan-Boltzman law
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Water always boils when its

  1. A. Temperature reaches 100° C
  2. B. Vapour pressure equals 76 cm of Hg
  3. C. Saturated vapour pressure equals the external pressure on its surface
  4. D. Saturated vapour pressure is less than the atmospheric pressure
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The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

  1. A. 2.36
  2. B. 4.36
  3. C. 120.36
  4. D. Dependent on N Re only
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The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

  1. A. Prandtl
  2. B. Nusselt
  3. C. Stanton
  4. D. Grashoff
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The advantage of backward feed multiple effect evaporators over forward feed units is that

  1. A. Heat sensitive material can be handled
  2. B. There is no additional cost of pumping
  3. C. Most concentrated liquid is at highest temperature
  4. D. Equal heat transfer co-efficients exist in various effects
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