Thermodynamics and Jet Engines Quiz
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Questions and Answers

What is the overall efficiency of the unit in percent if it consumes 3 kg of coal per second as received having a value of 25,102 kJ/kg?

  • 80.67
  • 88.28
  • 78.82
  • 65.72 (correct)

    • What is the thermal efficiency of the Rankine cycle if steam enters the turbine at 2.5 MPa and the condenser is at 50 kPa?

  • 45.23%
  • 12.34%
  • 25.55% (correct)
  • 34.23%

    • If a thermal power plant generates 5 MW and the heat generated by fuel is 13,000 kJ/s, what is the power needed for the auxiliaries if the thermal efficiency is 36.15%?

  • 400 kW
  • 300 kW
  • 310 kW (correct)
  • 350 kW

    • In a superheat steam Rankine cycle, what should be the pump work in kJ/kg if the turbine inlet conditions are 17.5 MPa and 530°C and the turbine and pump polytropic efficiencies are 0.85 and 0.75 respectively?

    <p>25.32</p> Signup and view all the answers

    In an open feedwater heater for a steam plant, what is the mass flow rate of the subcooled liquid if the steam flow rate is 0.865 kg/s and the heater efficiency is 95%?

    <p>2.869 kg/s</p> Signup and view all the answers

    What is the enthalpy of steam at 5 MPa and 400°C?

    <p>3195.7 kJ/kg</p> Signup and view all the answers

    What is the entropy of steam at 2.5 MPa?

    <p>6.2575 kJ/kg-K</p> Signup and view all the answers

    What is the specific volume of water at 50 kPa?

    <p>0.00103 m³/kg</p> Signup and view all the answers

    What is the latent heat of vaporization at 7 bar?

    <p>1640.1 kJ/kg</p> Signup and view all the answers

    What is the enthalpy of saturated liquid at 7 bar?

    <p>697.22 kJ/kg</p> Signup and view all the answers

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