Boiler Draught and Combustion Quiz
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Questions and Answers

What is the function of the draught in a boiler?

  • To regulate the temperature of the boiler
  • To reduce the efficiency of combustion
  • To increase the pressure in the boiler
  • To force air to the fire and carry away gaseous products of combustion (correct)
  • Which type of draught is obtained through the use of a chimney?

  • Mechanical draught
  • Artificial draught
  • Natural draught (correct)
  • Stem jet draught
  • What is the primary classification of draught types mentioned in the text?

  • Industrial draught and residential draught
  • Mechanical draught and steam jet draught
  • Steam draught and chimney draught
  • Natural draught and artificial draught (correct)
  • What materials can be used to build a chimney for obtaining natural draught?

    <p>Masonry, concrete, or steel</p> Signup and view all the answers

    Why is proper combustion in a boiler furnace dependent on the quantity of air supplied?

    <p>To maintain optimal conditions for efficient burning</p> Signup and view all the answers

    What is the purpose of having a chimney in a boiler installation?

    <p>To produce draught for air and gas flow and to discharge combustion products safely</p> Signup and view all the answers

    What is the main reason for the draught produced by a chimney?

    <p>Difference in density between hot gases inside the chimney and cold air outside</p> Signup and view all the answers

    Why do the flue gases leaving a chimney in a natural draught system have a higher temperature compared to artificial draught systems?

    <p>To improve the thermal efficiency of the boiler plant installation</p> Signup and view all the answers

    What is one of the reasons for loss in draught in a chimney?

    <p>Frictional resistance in gas passages</p> Signup and view all the answers

    How does the absolute temperature of chimney gases relate to the effectiveness of chimney draught?

    <p>It must bear a certain relation to outside air temperature for maximum effectiveness</p> Signup and view all the answers

    Why does natural draught result in higher heat carried away by flue gases compared to artificial draught?

    <p>To meet minimum temperature requirements for producing a given draught</p> Signup and view all the answers

    In a chimney, what constitutes about 20% of the total draught loss?

    <p>Frictional resistance offered by flues</p> Signup and view all the answers

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