Heat Transfer MCQs with answers Page - 82

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. For handling severely scaling liquids which of the following evaporator will be preferred?

  • (A) Horizontal tube type
  • (B) Long vertical tube type
  • (C) Agitated film type
  • (D) Short vertical tube

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Q. The factor which affects nucleate pool boiling is

  • (A) Material of heating surface
  • (B) Surface condition of heating surface
  • (C) Physical properties of liquid
  • (D) All of the above

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Q. If the amount of radiant energy received per unit area per second from the sun is measured at the Earth, Mars and Jupiter it will be

  • (A) in the decreasing order - Jupiter, Mars, Earth
  • (B) in the increasing order - Jupiter, Mars, Earth
  • (C) identical on all the three planets
  • (D) 37,500 kg

A

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Q. Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?

  • (A) Increases due to convection
  • (B) Remains the same
  • (C) Decreases due to convection
  • (D) Decreases due to radiation

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Q. Transformer oil having kinematic viscosity of 3.66 x 10-6 m2/s flows through a tube 8 mm diameter at velocity of 0.6 m/s. The value of Reynolds number of flow would be

  • (A) 1510
  • (B) 1625
  • (C) 1000
  • (D) 1310

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Q. The thermal conductivity of wood depends upon

  • (A) Density
  • (B) Moisture content
  • (C) Temperature
  • (D) All of the above

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Q. Transient heat flow occurs in

  • (A) Cooling of casting
  • (B) Heating and cooling of buildings due to sun
  • (C) Electric conductors carrying current
  • (D) Melting of ice

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Q. If thermal conductivity of aluminium is say 100 units at 0?C, the thermal conductivity at 500?C will be closer to

  • (A) 37,500 kg
  • (B) 100 units
  • (C) 20 units
  • (D) 140 units

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Q. The highest value of thermal conductivity is expected for

  • (A) Solid ice
  • (B) Water
  • (C) Melting ice
  • (D) Steam

A

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Q. If the roof of a house is painted with a shiny metallic paint, the temperature inside will

  • (A) Rise
  • (B) Fall
  • (C) Remain unchanged
  • (D) Depends on other factors

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