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Mechanical Engineering :: Thermodynamics

  1. A cycle consisting of two constant pressure and two isentropic processes is known as

  2. A.

     Carnot cycle

    B.

     Stirling cycle

    C.

     Otto cycle

    D.

     None of these


  3. A cycle consisting of two adiabatic and two constant pressure processes is known as

  4. A.

     Otto cycle

    B.

     Ericsson cycle

    C.

     Joule cycle

    D.

     Stirling cycle


  5. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

  6. A.

     Otto cycle

    B.

     Stirling cycle

    C.

     Carnot cycle

    D.

     Diesel cycle


  7. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

  8. A.

     Adiabatic process

    B.

     Isothermal process

    C.

     Hyperbolic process

    D.

     Polytropic process


  9. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

  10. A.

     Increase

    B.

     Decrease

    C.

     Remain unchanged

    D.

     Increase/decrease depending on application


  11. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

  12. A.

     Increase

    B.

     Decrease

    C.

     Remain unchanged

    D.

     Increase/decrease depending on application


  13. Absolute zero pressure will occur

  14. A.

     At sea level

    B.

     When molecular momentum of the system becomes zero

    C.

     Under vacuum conditions

    D.

     At a temperature of 273°K


  15. In a free expansion process

  16. A.

     Work done is zero

    B.

     Heat transfer is zero

    C.

     Both (A) and (B) above

    D.

     Work done is zero but heat increases


  17. The ratio of two specific heats of air is equal to

  18. A.

     0.17

    B.

     0.24

    C.

     0.1

    D.

     1.41


  19. One kg of carbon produces ________ kg of carbon dioxide.

  20. A.

     3/7

    B.

     11/7

    C.

     11/3

    D.

     4/11