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Home Mechanical Engineering Heat Transfer, Refrigeration and Air Conditioning Comments

  • Question
  • The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called


  • Options
  • A. humidity ratio
  • B. relative humidity
  • C. absolute humidity
  • D. degree of saturation

  • Correct Answer
  • relative humidity 


  • Heat Transfer, Refrigeration and Air Conditioning problems


    Search Results


    • 1. The cooling system used for supersonic aircrafts and rockets is

    • Options
    • A. simple air cooling system
    • B. boot-strap air cooling system
    • C. reduced ambient air cooling system
    • D. regenerative air cooling system
    • Discuss
    • 2. Which of the following statement is correct?

    • Options
    • A. In vapour absorption refrigerator, the compression of refrigerent is avoided.
    • B. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
    • C. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
    • D. all of the above
    • Discuss
    • 3. Hydrogen is used in electrolux refrigeration system so as to __________ the rate of evaporation of the liquid ammonia passing through the evaporator.

    • Options
    • A. equalise
    • B. reduce
    • C. increase
    • Discuss
    • 4. An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by

    • Options
    • A.
    • B.
    • C. e1 + e2
    • D. e1e2
    • Discuss
    • 5. R-12 is generally preferred over R-22 in deep freezers since

    • Options
    • A. it has low operating pressures
    • B. it gives higher coefficient of performance
    • C. it is miscible with oil over large range of temperatures
    • D. all of the above
    • Discuss
    • 6. The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.

    • Options
    • A. good
    • B. bad
    • Discuss
    • 7. R-11 has the highest critical point temperature.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 8. The reciprocating refrigerant compressors are very suitable for

    • Options
    • A. small displacements and low condensing pressures
    • B. large displacements and high condensing pressures
    • C. small displacements and high condensing pressures
    • D. large displacements and low condensing pressures
    • Discuss
    • 9. The relative coefficient of performance is equal to

    • Options
    • A.
    • B.
    • C. Actual C.O.P. x Theoretical C.O.P.
    • D. none of these
    • Discuss
    • 10. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.

    • Options
    • A. True
    • B. False
    • Discuss


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