Related Mcqs:

1. 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.

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. Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?

   A. Stoichiometric combustion air
   B. Non-preheated combustion air
   C. Combustion air not enriched with oxygen
   D. Recuperators

4. 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

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. An improved and fuel efficient version of the pusher type reheating furnace is the ______________ furnace?

   A. Walking beam
   B. Shaft
   C. Tunnel
   D. Rotary hearth

7. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?

   A. Use of non-preheated combustion air
   B. Use of pulverised solid fuels
   C. Imperfect mixing of fuel & air and infiltration of air
   D. Use of excessive positive draft in the furnace

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

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

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