Heat Transfer MCQs with answers Page - 83

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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Q. Diffusion coefficient of water into air at 26?C is nearly

  • (A) 5.2 cm2/s
  • (B) 2.6 cm2/sec
  • (C) 0.026 cm2/s
  • (D) 0.26 cm2/s

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Q. A wall has two layers A and B, each made of a different material. Both the layers have the same thickness. The thermal conductivity of material of A is twice that of B. Under the thermal equilibrium the temperature difference across the wall is 30?C. The temperature drops in layers A and B will be respectively

  • (A) 15?C and 15?C
  • (B) cannot be predicated
  • (C) 37,500 kg
  • (D) 20?C and 10?C

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Q. Hydrogen cannot be liquefied at room temperature because

  • (A) it is a diatomic gas
  • (B) its critical temperature is less than the room temperature
  • (C) 37,500 kg
  • (D) it has low density

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Q. Ablation heat transfer method is used on

  • (A) nuclear war heads
  • (B) submarines
  • (C) 37,500 kg
  • (D) satellites

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Q. In case of a body transparent to thermal radiation

  • (A) transmissibility = 0
  • (B) 37,500 kg
  • (C) absorptivity = 1
  • (D) absorptivity = reflectivity = 0

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Q. The phenomenon of boiling the milk in an open container when milk spills over the vessel is termed as

  • (A) Film boiling
  • (B) Pool boiling
  • (C) Sub-cooled boiling
  • (D) Interface evaporation

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Q. A hollow sphere with uniform interior temperature and a small hole behaves very nearly as a

  • (A) White body
  • (B) Transparent body
  • (C) Opaque body
  • (D) Black body

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Q. If a body reflects entire radiation incident on it, then it is known as

  • (A) White body
  • (B) Black body
  • (C) Grey body
  • (D) Transparent body

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Q. Pipes are insulated so that

  • (A) There is minimum corrosion
  • (B) Heat loss from the surface is minimized
  • (C) They can withstand higher fluid pressures
  • (D) Vibrations resulting from fluid flow are minimized

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Q. An isotherm is a graph

  • (A) Showing pressure volume changes at constant temperature
  • (B) Connecting points of equal pressure
  • (C) Constant temperature
  • (D) Connecting points of equal temperature

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