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Home Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning Comments

  • Question
  • The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as


  • Options
  • A. conduction
  • B. free convection
  • C. forced convection
  • D. radiation

  • Correct Answer
  • free convection 


  • Heat Transfer, Refrigeration and Air Conditioning problems


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    • 1. During sensible heating of air __________ decreases.

    • Options
    • A. wet bulb temperature
    • B. relative humidity
    • C. dry bulb temperature
    • D. specific humidity
    • Discuss
    • 2. The thermostatic expansion valve is also called

    • Options
    • A. constant pressure valve
    • B. constant temperature valve
    • C. constant superheat valve
    • D. none of these
    • Discuss
    • 3. In a lithium bromide absorption refrigeration system

    • Options
    • A. lithium bromide is used as a refrigerant and water as an absorbent
    • B. water is used as a refrigerant and lithium bromide as an absorbent
    • C. ammonia is used as a refrigerant and lithium bromide as an absorbent
    • D. none of the above
    • Discuss
    • 4. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.

    • Options
    • A. Agree
    • B. Disagree
    • Discuss
    • 5. The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

    • Options
    • A. First law of thermodynamics
    • B. Newton's law of cooling
    • C. Newton's law of heating
    • D. Stefan's law
    • Discuss
    • 6. The material of pipe lines for a system using freon as a refrigerant should be

    • Options
    • A. brass
    • B. copper
    • C. steel
    • D. aluminium
    • Discuss
    • 7. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

    • Options
    • A. the better insulation must be put inside
    • B. the better insulation must be put outside
    • C. one could place either insulation on either side
    • D. one should take into account the steam temperature before deciding as to which insulation is put where
    • Discuss
    • 8. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

    • Options
    • A. conduction
    • B. convection
    • C. radiation
    • Discuss
    • 9. The lowest temperature during the cycle in a vapour compression system occurs after

    • Options
    • A. compression
    • B. expansion
    • C. condensation
    • D. evaporation
    • Discuss
    • 10. When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

    • Options
    • A. cooled and humidified
    • B. cooled and dehumidified
    • C. heated and humidified
    • D. heated and dehumidified
    • Discuss


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