Production of Draught and Its Losses Quiz

What is the definition of boiler draught?

• The pressure of outside air at the grate level

• The flow of air through the chimney

• The heat transfer coefficient in the boiler

• The difference in pressure between outside air and gases within a furnace or chimney at the grate level

What is the purpose of draught in a boiler?

• To force air through the fuel bed for proper combustion

• To increase the pressure inside the chimney

• To reduce the heat transfer coefficient

• To cool down the flue gases

Which method of draught production is classified as artificial draught?

• Natural draught

• Forced draught

• Balanced draught

• Induced draught

What is the main advantage of mechanical draught over natural draught?

• It requires a taller chimney

• It can produce higher values of draught

• It is less safe

• It is more expensive

In which type of draught system is a fan or blower located at the base of the chimney?

• Balanced draught

• Natural draught

• Induced draught

• Forced draught

What is the main disadvantage of mechanical draught?

• Low noise levels

• Low running costs

• Low maintenance costs

• High initial costs

What is the purpose of induced draught?

• To produce draught naturally

• To create a partial vacuum in the furnace and flue passage

• To increase the height of the chimney

• To force air through the fuel bed

Which type of draught is a combination of forced and induced draught?

• Natural draught

• Induced draught

• Forced draught

• Balanced draught

What is the main advantage of steam jet draught?

• High maintenance costs

• Low initial costs

• High noise levels

• High draught production

What is the purpose of artificial draught over natural draught?

• To increase smoke levels

• To reduce fuel consumption

• To increase chimney height

• To use high grade fuels