Exergy and Entropy: Energy Concepts Quiz
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Questions and Answers

What is the main concept behind the principle of degradation of energy?

  • The total energy available in a system
  • The minimum useful work possible during a process
  • The maximum useful work possible during a process (correct)
  • The constant entropy of a system

    • Which statement accurately describes the concept of exergy?

  • Exergy is the energy available to do work (correct)
  • Exergy is the unused heat in a system
  • Exergy is the total energy in a system
  • Exergy is the energy that cannot be used

    • What happens to the exergy of a system and surroundings once they reach equilibrium?

  • The exergy becomes infinite
  • The exergy remains constant
  • The exergy increases
  • The exergy decreases (correct)

    • In the context of exergy calculation, what does dividing each heat transfer by the absolute temperature of the thermal reservoir help determine?

    <p>The efficiency of the heat engine</p> Signup and view all the answers

    What did Rudolph Clausius outline in the 19th century regarding heat transfer and temperature?

    <p>The Clausius inequality for heat transfers and temperature</p> Signup and view all the answers

    What is the SEER a measure of?

    <p>Seasonal performance of cooling equipment</p> Signup and view all the answers

    Which unit is used for both EER and SEER?

    <p>Btu/Wh</p> Signup and view all the answers

    In a reversible process, what does not increase?

    <p>Entropy of the process</p> Signup and view all the answers

    What characterizes an irreversible process?

    <p>Increases the entropy of the system</p> Signup and view all the answers

    What type of process is internally reversible?

    <p>Process with minimum entropy generation</p> Signup and view all the answers

    What is the relation between EER (or SEER) and Coefficient of Performance (COP) for a device with COP = 1?

    <p>$EER = 3.412 \times COP$</p> Signup and view all the answers

    What is the key difference between an isolated system and an ideal process?

    <p>The available energy decreases in an isolated system and is conserved in an ideal process.</p> Signup and view all the answers

    Which term is synonymous with exergy?

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

    How is exergy defined in the context of thermodynamics?

    <p>Exergy is the difference between the internal energy of a system and the energy needed to bring it to a reference state.</p> Signup and view all the answers

    Why does the exergy of a system decrease as it performs work?

    <p>Due to the laws of thermodynamics preventing complete conversion of exergy into work.</p> Signup and view all the answers

    What factor determines the exergy of a system in relation to its reference state?

    <p>Temperature and pressure of the reference state.</p> Signup and view all the answers

    Which principle states that in all real processes, entropy increases?

    <p>Principle of Entropy</p> Signup and view all the answers

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