A. Physical nature, ash content and fineness of the coal
B. Amount of excess air supplied and load on the boiler
C. Type of burner and combustion chamber
D. All A., B. and C.
Related Mcqs:
- In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
A. Rate of firing and emissivity of flame
B. Thermal conductivity of the charge & structural materials of furnace
C. Nature of process; whether batch, continuous or intermittent
D. All A., B. and C. - Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?
A. Quantity & temperature of waste gas
B. Dust concentration & nature of dust in waste gas
C. Corrosive nature of the waste gas
D. All A., B. and C. - The amount of combustible escaping unconsumed from the furnace, depends upon the________________?
A. Air supplied and furnace temperature
B. Burner design (thoroughness of mixing versus stratification)
C. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by
change of direction)
D. All A., B. and C. - 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 - 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. Higher power consumption in its transportation
D. Erosion of induced draft fan blades - The rate of scaling of furnace stock depends upon the_________________?
A. Temperature
B. Time
C. Nature of atmosphere
D. All A., B. and C. - Size of the combustion chamber of a furnace depends upon the ___________________?
A. Heat release rate of the fuel
B. Preheat temperature of fuel & air
C. Method of mixing the fuel & air
D. All A., B. and C. - An example of shaft furnace is the__________________?
A. L.D. converter
B. Glass melting tank
C. Blast furnace
D. Soaking pit - In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
A. Ostwald chart
B. Cox chart
C. Sankey diagram
D. None of these - An example of recuperative furnace is the__________________?
A. Soaking pit
B. Open hearth furnace
C. Coke ovens
D. None of these
