Heat Transfer MCQs with answers Page - 89

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. Fouling factor

  • (A) Measures the heat transfer efficiency
  • (B) Is used only in case of Newtonian fluids
  • (C) Is used when a liquid exchanges heat with a gas
  • (D) Is virtually a factor of safety in heat exchanger design

A

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Q. A dimensionless number representing the ratio of inertia forces to viscous forces is known as

  • (A) Mach number
  • (B) Prandtl number
  • (C) Reynolds number
  • (D) Nusselt number

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Q. Thermal conductivity of wood least depends on

  • (A) Moisture
  • (B) Density
  • (C) Temperature
  • (D) Grain orientation

A

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Q. Heat is transferred from an insulated pipe to the surrounding still air mainly by

  • (A) Free convection
  • (B) Forced convection
  • (C) All above together
  • (D) Radiation

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Q. Dynamic similarity refers to the similarity of

  • (A) 37,500 kg
  • (B) temperature and heat flux
  • (C) masses and forces
  • (D) physical dimensions

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Q. A sphere 15 cm in diameter is covered with 5 cm of insulation (k = 0.057 kcal/m-hr-?C). The inside and outside surface temperature of the insulation are 315?C and 80?C respectively. The heat loss per sq. m of the outside surface will be closer to

  • (A) 80 kcal/hr
  • (B) 320 kcal/hr
  • (C) 160 kcal/hr
  • (D) 37,500 kg

A

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Q. The net radiant interchange per square metre for two large parallel planes at temperatures of 1000?K and 100?K respectively, would be roughly

  • (A) 240 kcal/hr
  • (B) 75 kcal/hr
  • (C) 25 kcal/hr
  • (D) 480 kcal/hr

A

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Q. Which variety of steel may be expected to have lowest value of thermal conductivity?

  • (A) High carbon steel (0.83% C)
  • (B) Low nickel steel (1.37% Ni)
  • (C) Low chromium steel (0.46% Cr)
  • (D) Chromium nickel steel (9% Ni, 18% Cr)

A

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Q. In an air-conditioning plant a cooling tower is used to cool

  • (A) air
  • (B) refrigerant
  • (C) condenser water
  • (D) None of the above

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