Combustion Process Overview
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Questions and Answers

What is the term for the lowest temperature at which a substance ignites?

  • Combustion temperature
  • Ignition temperature (correct)
  • Flame temperature
  • Calorific temperature
  • Which type of combustion releases a huge amount of heat and light at a high speed?

  • Spontaneous combustion
  • Controlled combustion
  • Rapid combustion (correct)
  • Slow combustion
  • What is the main difference between inflammable and combustible substances?

  • Combustible substances have a higher ignition temperature.
  • Inflammable substances react slowly with oxygen.
  • Inflammable substances easily catch fire with a flame. (correct)
  • Combustible substances produce less heat during combustion.
  • What is the visible gaseous part of a light called?

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

    Which of the following is a property of fuels?

    <p>They burn to produce heat energy.</p> Signup and view all the answers

    What is the process in which large amounts of gas are evolved along with tremendous heat, light, and sound?

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

    What is the calorific value of a fuel?

    <p>The heat energy released on complete combustion of 1kg of the fuel</p> Signup and view all the answers

    Why is it difficult to burn a heap of green leaves compared to dry leaves?

    <p>Green leaves contain moisture, increasing their ignition temperature</p> Signup and view all the answers

    Why does a goldsmith use the outermost zone of a candle flame for melting gold and silver?

    <p>It is the hottest part of the flame</p> Signup and view all the answers

    Is rusting considered combustion? Why or why not?

    <p>No, because no heat is produced during rusting</p> Signup and view all the answers

    In which part of the flame should a beaker be placed to heat water fastest?

    <p>Outermost zone</p> Signup and view all the answers

    What is the unit for calorific value of a fuel?

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

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