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Heat Transfer, Refrigeration and Air Conditioning problems

  • 1. The heat transfer by conduction through a thick sphere is given by

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 2. The wet bulb temperature during sensible heating of air

  • Options
  • A. remains constant
  • B. increases
  • C. decreases
    • Discuss
  • 3. During sensible cooling of air __________ decreases.

  • Options
  • A. wet bulb temperature
  • B. relative humidity
  • C. dry bulb temperature
  • D. specific humidity
    • Discuss
  • 4. The relative humidity decreases as air gets wet.

  • Options
  • A. True
  • B. False
    • Discuss
  • 5. An electrolux refrigerator is called a __________ absorption system.

  • Options
  • A. single fluid
  • B. two fluids
  • C. three fluids
    • Discuss
  • 6. The heat transfer by radiation __________ a medium.

  • Options
  • A. requires
  • B. does not require
    • Discuss
  • 7. The C.O.P. of an absorption type refrigerator is given by (where T1 = Temperature at which the working substance receives heat, T2 = Temperature of cooling water, and T3 = Evaporator temperature)

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 8. The highest thermal diffusivity is of

  • Options
  • A. iron
  • B. lead
  • C. concrete
  • D. wood
    • Discuss
  • 9. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

  • Options
  • A. equal to one
  • B. greater than one
  • C. less than one
  • D. equal to Nusselt number
    • Discuss
  • 10. Thermal diffusivity is a

  • Options
  • A. function of temperature
  • B. physical property of a substance
  • C. dimensionless parameter
  • D. all of these
    • Discuss

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