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Mechanical Engineering :: Thermodynamics

  1. The principal constituents of a fuel are

  2. A.

     Carbon and hydrogen

    B.

     Oxygen and hydrogen

    C.

     Sulphur and oxygen

    D.

     Sulphur and hydrogen


  3. The compression ratio is the ratio of

  4. A.

     Total volume to swept volume

    B.

     Swept volume to clearance volume

    C.

     Swept volume to total volume

    D.

     Total volume to clearance volume


  5. The gas constant (R) is equal to the __________ of two specific heats.

  6. A.

     Product

    B.

     Sum

    C.

     Difference

    D.

     Ratio


  7. When the expansion or compression takes place according to the law pvn = C, the process is known as

  8. A.

     Isothermal process

    B.

     Adiabatic process

    C.

     Hyperbolic process

    D.

     Polytropic process


  9. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

  10. A.

     Free expansion

    B.

     Hyperbolic expansion

    C.

     Adiabatic expansion

    D.

     Throttling


  11. In an irreversible process, there is a

  12. A.

     No loss of heat

    B.

     Loss of heat

    C.

     Gain of heat

    D.

     No gain of heat


  13. Second law of thermodynamics defines

  14. A.

     Heat

    B.

     Work

    C.

     Internal energy

    D.

     Entropy


  15. Which of the following variables controls the physical properties of a perfect gas?

  16. A.

     Pressure

    B.

     Temperature

    C.

     Volume

    D.

     All of the above


  17. Which of the following laws is applicable for the behaviour of a perfect gas?

  18. A.

     Boyle's law

    B.

     Charles ‘law

    C.

     Gay Lussac’s law

    D.

     All of the above


  19. Which of the following process can be made reversible with the help of a regenerator?

  20. A.

     Constant pressure process

    B.

     Constant volume process

    C.

     Constant pvn process

    D.

     All of these