The mechanical draught _________ with the amount of smoke.
A. Increases
B. Decreases
C. Does not effect
D. None of these
Answer: Option A
Solution (By Examveda Team)
Mechanical draught refers to the artificial method of supplying air and removing flue gases using fans in a boiler system.Smoke formation occurs due to incomplete combustion of fuel, which indicates insufficient air supply.
When the amount of smoke increases, it means combustion is poor and more air is required to burn the fuel completely.
To overcome this, the mechanical draught is increased so that more air is supplied to the furnace, improving combustion and reducing smoke.
Hence, mechanical draught increases with the amount of smoke.
This Question Belongs to Mechanical Engineering >> Steam Boilers, Engines, Nozzles And Turbines
ID fan create a negative flow, so flue gas in the furnace always be negative, if we maintain positive draught in furnace explosion may occur
draught is produce to controlling rate of flow air anf flue gases in the plant.
draught produce by fan chimmnry steam jet ect
if fan placed at past to boiler than it is called forced draught
if fan is placed at bottom of chimmnry than induced draught