Thermodynamics and Energy Conversion Efficiency
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Questions and Answers

What does the efficiency of a water heater measure?

  • The amount of fuel burned in the water heater
  • The temperature rise of the water inside the heater
  • The energy delivered to the house by hot water (correct)
  • The volume of hot water produced

    • What is the heating value of a fuel?

  • The time taken for combustion
  • The amount of heat released when burning the fuel (correct)
  • The color of the flame
  • The initial temperature of the fuel

    • How is the lower heating value (LHV) different from the higher heating value (HHV)?

  • LHV includes the heat of vaporization, HHV does not (correct)
  • LHV occurs at higher temperatures than HHV
  • HHV is always lower than LHV
  • HHV accounts for inefficiencies, LHV does not

    • What does a generator do?

    <p>Converts mechanical energy to electrical energy</p> Signup and view all the answers

    How is generator efficiency defined?

    <p>Ratio of electrical power output to mechanical power input</p> Signup and view all the answers

    What does the thermal efficiency of a power plant measure?

    <p>Ratio of net electrical power output to fuel energy input</p> Signup and view all the answers

    What is the relationship between the power of a compact fluorescent lamp and an incandescent lamp of the same light output?

    <p>The compact fluorescent lamp has 1/4 the power of the incandescent lamp</p> Signup and view all the answers

    Which of the following is the best definition of mechanical efficiency?

    <p>The effectiveness of the conversion process between the mechanical work supplied or extracted and the mechanical energy of the fluid</p> Signup and view all the answers

    What is the overall efficiency of a turbine-generator system?

    <p>The product of the efficiency of the turbine and the efficiency of the generator</p> Signup and view all the answers

    If a fan has a mechanical efficiency of 0.80, what is the ratio of the kinetic energy of the air at the fan exit to the mechanical power input?

    <p>0.80</p> Signup and view all the answers

    What is the unit of mechanical power input to a fan?

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

    Which of the following is the correct unit for mechanical energy per unit mass?

    <p>Joules per kilogram</p> Signup and view all the answers

    The rate of mechanical energy of a flowing fluid per unit mass is equal to:

    <p>The sum of the kinetic and potential energy per unit mass</p> Signup and view all the answers

    The change in mechanical energy of a fluid during incompressible flow per unit mass is given by the expression:

    <p>$\frac{1}{2}v^2 + gz$</p> Signup and view all the answers

    The rate of mechanical energy change of a fluid during incompressible flow is proportional to:

    <p>The mass flow rate</p> Signup and view all the answers

    According to the kinetic theory, heat is the energy associated with the:

    <p>Random motion of atoms and molecules</p> Signup and view all the answers

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