Energy Efficiency Calculation and Units Conversion Quiz
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Questions and Answers

In the context of power usage, what is the average daily power usage for electricity and gas combined?

  • 13 kWh - 10,800 kJ
  • 13 kWh + 10,800 kJ (correct)
  • 13 kWh * 10,800 kJ
  • 13 kWh / 10,800 kJ

    • What is the formula for mechanical energy efficiency?

  • Efficiency = (Total energy input / Useful energy output) * 100%
  • Efficiency = (Useful energy output / Total energy input) * 100% (correct)
  • Efficiency = Useful energy output - Total energy input
  • Efficiency = Total energy input - Useful energy output

    • What is the efficiency of an engine that produces 7 kW of electricity from a 29 MJ/h input?

  • 87% (correct)
  • 70%
  • 83%
  • 100%

    • What is the formula to convert temperature from Celsius to Kelvin?

    <p>K = C + 273.16</p> Signup and view all the answers

    What is the temperature in Fahrenheit if the temperature in Celsius is 25.5°C?

    <p>-2.2°F</p> Signup and view all the answers

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