Pulverised fuel fired furnaces employ ______________ fuel firing?

Related Mcqs:

1. 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 A., B. and C.

2. 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

3. 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

4. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?

   A. Low emissivity
   B. High thermal conductivity
   C. Both A. and B.
   D. Neither A. nor B.

5. Fuel economy in furnaces can be achieved by_________________?

   A. Using oxygen enriched combustion air
   B. Preheating the combustion air
   C. Reducing the heat loss through furnace openings & doors
   D. All A., B. and C.

6. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?

   A. 2000
   B. 3000
   C. 4500
   D. 6000

7. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

   A. Preheating the combustion air
   B. Oxygen enrichment of combustion air
   C. Preheating the fuel gas
   D. All A., B. & C.

8. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?

   A. < 2
   B. < 5
   C. < 8
   D. < 10

9. Use of pulverised coal in boilers provides____________________?

   A. Higher calorific value
   B. Better combustion
   C. Smokeless burning
   D. Less erosion on furnace wall

10. Shaft furnaces are used for_______________________?

    A. Smelting
    B. Calcining
    C. Roasting
    D. All A., B. and C.