Heat Transfer MCQs with answers Page - 9

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
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Q. In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

  • (A) Infinity
  • (B) Zero
  • (C) Same as average heat transfer co-efficient for tube side
  • (D) None of these

A

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Q. Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

  • (A) Between two bodies in physical contact with each other
  • (B) Between two bodies not in physical contact with each other
  • (C) From one part of a body to the another part of the same body
  • (D) Both B & C

A

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Q. At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

  • (A) 1
  • (B) < 1
  • (C) > 1
  • (D) None of these

A

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Q. In a backward feed multiple effect evaporator

  • (A) Feed is introduced in the first effect
  • (B) Feed flows from low pressure to high pressure
  • (C) No pumps are required between successive effects
  • (D) None of these

A

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Q. Which type of heat exchanger is preferred for heavy heat loads?

  • (A) Double pipe
  • (B) Plate fine
  • (C) Series and parallel set of shell and tube
  • (D) None of these

A

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Q. A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

  • (A) 5 minutes
  • (B) 10 minutes
  • (C) 20 minutes
  • (D) 40 minutes

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Q. Boiling point elevation of an ideal solution

  • (A) Increases rapidly with temperature rise
  • (B) In independent of pressure
  • (C) Decreases rapidly with temperature rise
  • (D) Both B and C

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Q. The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

  • (A) 1/2
  • (B) 1/4
  • (C) 2
  • (D) 4

A

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Q. Pick out the wrong statement.

  • (A) The controlling resistance in case of heating of air by condensing steam is in the air film
  • (B) The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature
  • (C) In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs
  • (D) Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature

A

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Q. A body is called grey if the monochromatic emissivity of the body is

  • (A) Zero
  • (B) Unity
  • (C) Same for all wavelengths
  • (D) Different for all wavelengths

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