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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
  • Question

  • If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.


  • Options
  • A. increases
  • B. decreases

  • Correct Answer
  • decreases 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. Dehydration is the process of removing water vapour from the surrounding air.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The capacity of the cooling tower and spray ponds __________ as the wet bulb temperature of air decreases.

    • Options
    • A. increases
    • B. decreases
      • Discuss
    • 3. The evaporator used in house-hold refrigerators is

    • Options
    • A. frosting evaporator
    • B. non-frosting evaporator
    • C. defrosting evaporator
    • D. none of these
      • Discuss
    • 4. The air cooling system mostly used in transport type aircrafts is

    • Options
    • A. simple air cooling system
    • B. simple evaporative air cooling system
    • C. boot-strap air cooling system
    • D. all of these
      • Discuss
    • 5. The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

    • Options
    • A. humidity ratio
    • B. relative humidity
    • C. absolute humidity
    • D. degree of saturation
      • Discuss
    • 6. The heat transfer by conduction through a thick cylinder(Q) is given by (where T1 = Higher temperature, T2 = Lower temperature, r1 = Inside radius, r2 = Outside radius, l = Length of cylinder, and k = Thermal conductivity)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The rato of energy transferred by convection to that by conduction is called

    • Options
    • A. Stanton number
    • B. Nusselt number
    • C. Biot number
    • D. Peclet number
      • Discuss
    • 8. Upto the critical radius of insulation,

    • Options
    • A. added insulation will increase heat loss
    • B. added insulation will decrease heat loss
    • C. convective heat loss will be less than conductive heat loss
    • D. heat flux will decrease
      • Discuss
    • 9. The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Pressure of water vapour is given by

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss

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