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Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning

  1. The power per tonne of refrigeration is

  2. A.
    3.5/C.O.P.
    B.
    C.O.P/3.5
    C.
    3.5 x C.O.P.
    D.
    none of these

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  3. 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

  4. A.
    conduction
    B.
    free convection
    C.
    forced convection
    D.
    radiation

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  5. The thermostatic expansion valve is also called

  6. A.
    constant pressure valve
    B.
    constant temperature valve
    C.
    constant superheat valve
    D.
    none of these

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  7. In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is

  8. A.
    2.5
    B.
    3.0
    C.
    4.0
    D.
    5.0

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  9. The specific humidity during cooling and dehumidification

  10. A.
    remains constant
    B.
    increases
    C.
    decreases

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  11. The capillary tube, as an expansion device, is used in

  12. A.
    domestic refrigerators
    B.
    water coolers
    C.
    room air conditioners
    D.
    all of these

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  13. In aircraft, air refrigeration Cycle is used because of

  14. A.
    low weight per tonne of refrigeration
    B.
    high heat transfer rate
    C.
    low temperature at high altitudes
    D.
    higher coefficient of performance

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  15. The material of pipe lines for a system using freon as a refrigerant should be

  16. A.
    brass
    B.
    copper
    C.
    steel
    D.
    aluminium

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  17. The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.

  18. A.
    Yes
    B.
    No

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  19. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

  20. A.
    wet vapour region
    B.
    superheated vapour region
    C.
    sub-cooled liquid region
    D.
    none of these

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