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

Related Mcqs:

1. 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...

2. 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....

3. Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?

   A. Coke oven B. Blast furnace stoves C. Beehive coke oven D. High pressure boiler...

4. 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...

5. To reduce the stack loss, heat recovery from flue gas can be done by_____________________?

   A. Preheating of cold stock B. Preheating of combustion air C. Steam generation in waste heat boilers D. All A., B. and C....

6. 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...

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. Scaling of furnace stock is reduced by _______________ in flue gas?

   A. CO B. H2 C. High CO/CO2 D. All A., B. & C....

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. 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...