Heat Transfer MCQs with answers Page - 88

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. A sphere of radius 40 cm is lagged to a radius of 50 cm. The temperatures of outer and inner surfaces are 66?C and 235?C respectively. Thermal conductivity of logging per cm thickness is 0.7 kcal/m-hr?C. The rate of heat leakage will be

  • (A) 500 kcal/hr
  • (B) 1.49 kcal/hr
  • (C) 666 kcal/hr
  • (D) 298 kcal/hr

A

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Q. A non-dimensional number generally associated with natural convection heat transfer is

  • (A) Prandtl number
  • (B) Weber number
  • (C) Peclet number
  • (D) Grashof number

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Q. Prandtl number for gases is

  • (A) more than 1000
  • (B) 37,500 kg
  • (C) near unity
  • (D) between 100 and 1000

A

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Q. Molecular transmission of heat is smallest in case of

  • (A) Alloys
  • (B) Solids
  • (C) Liquids with impurities
  • (D) Gases

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Q. Which one of the following will have least value of thermal conductivity?

  • (A) Silver
  • (B) Water
  • (C) Glass
  • (D) Air

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Q. Which of the following property of air does not increase with rise in temperature?

  • (A) Specific volume
  • (B) Specific gravity
  • (C) Thermal conductivity
  • (D) Thermal diffusivity

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Q. Entrainment separator is used in evaporators to

  • (A) Reduce the boiling point
  • (B) Increase the boiling point
  • (C) Separate liquid droplets from vapour
  • (D) Prevent foaming

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Q. Which of the following can be used to measure a temperature around -50?C?

  • (A) Platinum resistance thermometer
  • (B) Thermocouple
  • (C) Alcohol thermometer
  • (D) Mercury thermometer

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Q. The surface temperature of the sun is

  • (A) 20000?K
  • (B) 2000?K
  • (C) 6000?K
  • (D) Infinitely large

A

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Q. What whould be shape of an ideal thermometer?

  • (A) Spherical
  • (B) Cylindrical
  • (C) Cubical
  • (D) Rectangular

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