Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?

Related Mcqs:

1. Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?

   A. CO content
   B. Dew point
   C. CO2 content
   D. O2 content

2. When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?

   A. CO2
   B. CO
   C. O2
   D. C

3. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?

   A. CO
   B. CO2
   C. H2O
   D. Both B. & C.

4. Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?

   A. % of CO2 in
   B. % of O2in
   C. Temperature of
   D. Colour of

5. If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?

   A. Incomplete combustion
   B. Dry gas/stack gas loss
   C. Moisture loss
   D. None of these

6. For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?

   A. Increase
   B. Decrease
   C. Increase or decrease depending on the fuel type
   D. Not change

7. Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?

   A. 71%
   C. In between 37 & 71%
   D. None of these

8. A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?

   A. Presence of large quantity of hydrogen in the fuel
   B. Low calorific value of the fuel
   C. High sulphur content in the fuel
   D. Lack of thorough mixing of fuel with air

9. Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?

   A. 4
   B. 96
   C. 20
   D. 40

10. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?

    A. Tar
    B. Sulphide Coke
    C. Coke Oven Gas
    D. Pulverised coke

    Submitted by: Muhammad Mutsadiq Umer