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Boiler Draught and Combustion Quiz

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Questions and Answers

What is the function of draught in a boiler?

To absorb excess heat from the boiler
To force air to the fire and carry away gaseous products of combustion (correct)
To increase the pressure inside the boiler
To cool down the boiler components

What are the two main types of draught mentioned in the text?

Internal draught and external draught
High draught and low draught
Warm draught and cold draught
Natural draught and artificial draught (correct)

How is natural draught obtained in a boiler system?

By reducing the air flow
By installing a mechanical device
Through the use of a chimney (correct)
By increasing the fuel temperature

What does a chimney do in a boiler installation?

Produces the draught and carries combustion products upward (A) Signup and view all the answers

Why is proper combustion important in a boiler furnace?

To ensure efficient heat generation (B) Signup and view all the answers

In what ways can artificial draught be classified?

Stem jet and mechanical (C) Signup and view all the answers

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

Density difference between hot gases inside the chimney and cold air outside (A) Signup and view all the answers

Why are the flue gases leaving a chimney hotter in a natural draught system compared to an artificial draught system?

Higher flue gas temperature leads to more heat carried away by flue gases (B) Signup and view all the answers

Which factor affects the efficiency of a chimney in terms of steam generation, according to the text?

Heat carried away by flue gases (B) Signup and view all the answers

What is one of the reasons for draught loss in a chimney, as mentioned in the text?

Frictional resistance offered by the flues (A) Signup and view all the answers

What is the condition for maximum discharge of a chimney, based on the text?

Relation between absolute temperature of chimney gases and outside air temperature (C) Signup and view all the answers

Why does draught loss occur near bends in the gas flow circuit, according to the text?

Frictional resistance (C) Signup and view all the answers

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