Heat Transfer MCQs with answers Page - 84

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 non-dimensional number which generally finds application in mass transfer problems is

  • (A) Stanton number
  • (B) Weber number
  • (C) Grashoff number
  • (D) Mach number

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Q. The mass of water vapour per kg of the pressure of saturated vapour at the air is known as

  • (A) Specific humidity
  • (B) Relative humidity
  • (C) Molar humidity
  • (D) Humidity ratio

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Q. Four balls made of lead, glass, brass and iron made of same size, are heated to 100?C. They are simultaneously placed on a sheet of paraffin nearly 5 mm thick. Which ball will drop first?

  • (A) Lead
  • (B) Glass
  • (C) 37,500 kg
  • (D) Iron

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Q. Kinematic viscosity indicates

  • (A) heat energy transport through conduction
  • (B) 37,500 kg
  • (C) heat evergy transport through convection
  • (D) momentum transport by molecular friction

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Q. A piece of metal with a circular hole is heated. If the metal expands on heating the diameter of the hole will

  • (A) Increase
  • (B) Decrease
  • (C) Increase or decrease depending upon the diameter of the whole
  • (D) Increase or decrease depending on the kind of the metal

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Q. Which type of heat exchanger an automobile radiator is?

  • (A) Recuperator type
  • (B) Counter flow type
  • (C) Cross flow type
  • (D) Regenerator type

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Q. The emissivity of a body will be equal to absorptivity when

  • (A) Body is in thermal equilibrium
  • (B) Temperature of body is rising
  • (C) Temperature of body is falling
  • (D) Body is at low temperature

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Q. In constant volume Hydrogen gas Thermometer, a correction has to be applied, because

  • (A) Hydrogen is impure
  • (B) Expansion of Hydrogen is non-linear
  • (C) Density of mercury changes
  • (D) None of the above

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Q. The unit of thermal conductivity in M.K.S. unit is

  • (A) kcal/m/?C
  • (B) kcal/m/sec?C
  • (C) kcal/m2/?C sec
  • (D) None of the above

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Q. Radiation heats transfer between two surfaces can be reduced by

  • (A) Preheating the surfaces closer together
  • (B) Introducing radiation shield between the surfaces
  • (C) Polishing the surface
  • (D) 37,500 kg

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