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  1. Joule-Thomson effect i.e., a throttling process is a constant __________ process.

  2. A.

     Entropy

    B.

     Temperature

    C.

     Internal energy

    D.

     Enthalpy


  3. Throttling (Joule-Thomson effect) process is a constant __________ process.

  4. A.

     Enthalpy

    B.

     Entropy

    C.

     Pressure

    D.

     None of these


  5. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

  6. A.

     Vapor compression cycle using expansion valve

    B.

     Air refrigeration cycle

    C.

     Vapor compression cycle using expansion engine

    D.

     Carnot refrigeration cycle


  7. A nozzle is a device, which

  8. A.

     Increases kinetic energy and decreases pressure

    B.

     Reduces kinetic energy and increases pressure

    C.

     Reduces both kinetic energy and pressure

    D.

     Increases both kinetic energy and pressure


  9. The first law of thermodynamics is a statement of conservation of

  10. A.

     Heat

    B.

     Momentum

    C.

     Energy

    D.

     Work


  11. The total change in the enthalpy of a system is independent of the

  12. A.

     Number of intermediate chemical reactions involved

    B.

     Pressure and temperature

    C.

     State of combination and aggregation in the beginning and at the end of the reaction

    D.

     None of these


  13. All gases above its inversion temperature, in a throttling process will show

  14. A.

     A heating effect

    B.

     No change in temperature

    C.

     A cooling effect

    D.

     Either A or C


  15. Which of the following is an undesirable characteristics of a refrigerant ?

  16. A.

     It should be non-explosive

    B.

     It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

    C.

     Its vapor pressure at the condenser temperature should be very high

    D.

     None of these


  17. The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the

  18. A.

     Lewis-Randall rule

    B.

     Statement of Vant-Hoff equation

    C.

     Le-Chatelier's principle

    D.

     None of these


  19. Linde gas liquefaction process employs cooling

  20. A.

     By throttling

    B.

     By expansion in an engine

    C.

     At constant pressure

    D.

     None of these