Related Questions

Coal is pulverised before burning in large capacity boiler furnaces mainly to
A Ensure its complete combustion
B Facilitate easy ash removal
C Enhance its calorific value
D Provide trouble free operation
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value
A (1- moisture content)
B (1 + moisture content)
C 1 + moisture content
D 1 – moisture content
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
A Transportation of coal
B Drying of coal
C Combustion of coal by supplying it around the burner
D Preheating the primary air
The main function of primary air in pulverised coal fired burner is to
A Burn CO to CO2
B Dry and transport the coal
C Have proper combustion by supplying it around the burner
D Preheat the tertiary air used for complete combustion of CO to CO2
Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
A Ash disposal problem
B Excessive fly ash discharge from the stack
C Higher power consumption in its transportation
D Erosion of induced draft fan blades
The advantages of firing pulverised coal in the furnace lies in the fact that, it
A Permits the use of high ash content coal
B Permits the use of low fusion point ash coal
C Accelerates the burning rate and economises on fuel consumption
D All of the above
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
A Ash disposal problem
B Excessive fly-ash discharge from the stack
C High power consumption in its transportation
D Erosion of induced draft fan blades
Pulverised coal used in boiler firing need not have
A Less moisture content
B High fusion point of its ash
C High bulk density
D Lower ash content
Function of secondary air in pulverised coal firing is to
A Transport the coal to the burner
B Dry the coal
C Ensure efficient burning of coal around the burner
D Reduce primary air requirement
The advantage of firing pulverised coal in the furnace lies in the fact, that it
A Permits the use of high ash content coal
B Permits the use of low fusion point ash coal
C Accelerates the burning rate and economises on fuel combustion
D All of the above

Next steps