Related Questions

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
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 size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase
A Increases
B Decreases
C Remains unchanged
D Increases/decreases depending on steam temperature requirements
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as
A Blow off cock
B Fusible plug
C Superheater
D Stop valve
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
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
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
Use of pulverised coal in boiler furnace provides
A High calorific value
B Better combustion
C Smokeless burning
D Less erosion on furnace walls
Combustion of pulverised coal as compared to that of lump coal
A Develops a non-luminous flame
B Develops a low temperature flame
C Can be done with less excess air
D Provides a lower rate of heat release

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