Thermodynamics Miscellaneous

Thermodynamics Miscellaneous

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Thermodynamics

Thermodynamics Miscellaneous
  1. The figure below shows a thermodynamic cycle undergone by a certain system. Find the mean effective pressure in N/m2.









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    Work done = Area under the cycle

    Work done =
    1
    		 × 3 × 0.02 = 0.03 kNm
    2

    mep =
    Work done
    		 =
    0.03
    		 = 1.5 kPa or 1500 N / m2
    Volume0.02

    Correct Option: A

    Work done = Area under the cycle

    Work done =
    1
    		 × 3 × 0.02 = 0.03 kNm
    2

    mep =
    Work done
    		 =
    0.03
    		 = 1.5 kPa or 1500 N / m2
    Volume0.02

  1. An air standard diesel cycle consists of








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    An air standard diesel cycle consists of one constant pressure, one constant volume and two adiabatic processes .

    Correct Option: C

    An air standard diesel cycle consists of one constant pressure, one constant volume and two adiabatic processes .

  1. In air standard Otto cycle the terminal pressures at the end of compression, heat release and expansion are respectively P2, P3 and P4. If the corresponding values are P2, P3 and P4 , taking into account the effect of variable specific heat and dissociation of the working fluid, then








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    P2 > P2', P3 > P3 '

    Correct Option: D

    P2 > P2', P3 > P3 '

  1. Consider a Rankine cycle with superheat. If the maximum pressure in the cycle is increased without changing the maximum temperature and the minimum pressure, the dryness fraction of steam after the isentropic expansion will increase








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    Consider a Rankine cycle with superheat. If the maximum pressure in the cycle is increased without changing the maximum temperature and the minimum pressure, the dryness fraction of steam after the isentropic expansion will increase ( False )

    Correct Option: B

    Consider a Rankine cycle with superheat. If the maximum pressure in the cycle is increased without changing the maximum temperature and the minimum pressure, the dryness fraction of steam after the isentropic expansion will increase ( False )

  1. A gas turbine cycle with infinitely large number of stages during compression and expansion leads to








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    Infinitely large number of stages during compression and expansion in the gas turbine cycle i .e. Brayton cycle leads to constant temperature and constant pressure cycle i.e. Ericson cycle .

    Correct Option: C

    Infinitely large number of stages during compression and expansion in the gas turbine cycle i .e. Brayton cycle leads to constant temperature and constant pressure cycle i.e. Ericson cycle .