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Mechanical Engineering :: Refrigeration and Air Conditioning

  1. The bank of tubes at the back of domestic refrigerator is

  2. A.

     Condenser tubes

    B.

     Evaporator tubes

    C.

     Refrigerant cooling tubes

    D.

     Capillary tubes

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  3. The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

  4. A.

     Same

    B.

     Lower

    C.

     Higher

    D.

     None of these

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  5. Carbon dioxide is

  6. A.

     Colourless

    B.

     Odourless

    C.

     Non-flammable

    D.

     All of these

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  7. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

  8. A.

     Involves no change in volume

    B.

     Takes place at constant temperature

    C.

     Takes place at constant entropy

    D.

     Takes place at constant pressure

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  9. The humidification process, on the psychrometric chart is shown by

  10. A.

     Horizontal line

    B.

     Vertical line

    C.

     Inclined line

    D.

     Curved line

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  11. For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

  12. A.

     Small

    B.

     High

    C.

     Equal

    D.

     Anything

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  13. Choose the correct statement

  14. A.

     A refrigerant should have low latent heat

    B.

     If operating temperature of system is low, then refrigerant with low boiling point should be used

    C.

     Pre-cooling and sub-cooling bf refrigerant are same

    D.

     Superheat and sensible heat of a refrigerant are same

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  15. The C.O.P. of a heat pump working on a reversed Carnot cycle is

  16. A.

     T₁/(T₂ - T₁)

    B.

     (T₂ - T₁)/T₁

    C.

     (T₁ - T₂)/T₁

    D.

     T₂/(T₂ - T₁)

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  17. Critical pressure of a liquid is the pressure

  18. A.

     Above which liquid will remain liquid

    B.

     Above which liquid becomes gas

    C.

     Above which liquid becomes vapour

    D.

     Above which liquid becomes solid

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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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