Related Mcqs:

1. 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.

2. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?

   A. 5
   B. 60
   C. 20
   D. 40

3. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?

   A. Economiser
   B. Regenerator
   C. Ceramic recuperator
   D. Waste heat boiler

4. Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?

   A. Ammonia
   B. Fine dolomite
   C. Alkaline powders
   D. None of these

5. Artificial draught produced by a fan in the furnace can be controlled by the___________________?

   A. Speed of the fan
   B. Damper
   C. Variation in the pitch of fan blades
   D. All A., B. and C.

6. Which furnace employs preheating, heating and soaking zones ?

   A. Soaking pit
   B. Reheating furnace
   C. Open hearth furnace
   D. Cupola

7. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an_________________?

   A. Economiser
   B. Steam superheater
   C. Air preheater
   D. All A., B. and C.

8. Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?

   A. 50
   B. 100
   C. 150
   D. 250

9. 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

10. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?

    A. Furnace oil with air
    B. Furnace oil with oxygen
    C. Blast furnace gas with air
    D. Blast furnace gas with oxygen