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Mechanical Engineering :: Thermodynamics

  1. Carnot cycle efficiency depends upon

  2. A.

     Properties of the medium/substance used

    B.

     Condition of engine

    C.

     Working condition

    D.

     Temperature range of operation


  3. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

  4. A.

     v1/v2

    B.

     v2/v1

    C.

     (v1 + v2)/v1

    D.

     (v1 + v2)/v2


  5. The gas turbine cycle with regenerator improves

  6. A.

     Work ratio

    B.

     Thermal efficiency

    C.

     Avoid pollution

    D.

     None of these


  7. The efficiency of a Carnot engine depends on

  8. A.

     Working substance

    B.

     Design of engine

    C.

     Size of engine

    D.

     Temperatures of source and sink


  9. Which of the following statement is incorrect?

  10. A.

     The liquid fuels have higher calorific value than solid fuels

    B.

     The solid fuels have higher calorific value than liquid fuels

    C.

     A good fuel should have low ignition point

    D.

     The liquid fuels consist of hydrocarbons


  11. Thermal power plant works on

  12. A.

     Carnot cycle

    B.

     Joule cycle

    C.

     Rankine cycle

    D.

     Otto cycle


  13. Which of the following is the property of a system?

  14. A.

     Pressure and temperature

    B.

     Volume and density

    C.

     Enthalpy and entropy

    D.

     All of the above


  15. Which law states that the specific heat of a gas remains constant at all temperatures and pressures?

  16. A.

     Charles' Law

    B.

     Joule's Law

    C.

     Regnault's Law

    D.

     Boyle's Law


  17. The temperature at which the volume of a gas becomes zero is called

  18. A.

     Absolute scale of temperature

    B.

     Absolute zero temperature

    C.

     Absolute temperature

    D.

     None of these


  19. In a steady flow process, the ratio of

  20. A.

     Heat transfer is constant

    B.

     Work transfer is constant

    C.

     Mass flow at inlet and outlet is same

    D.

     All of these