With increase in C/H ratio of a fuel, the dew point of flue gases______________________?

Related Mcqs:

1. 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

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

   A. Smoke
   B. Temperature
   C. Oxygen
   D. Carbon monoxide

3. High sulphur content in a fuel ______________ of the flue gases?

   A. Decreases the dew point
   B. Increases the dew point
   C. Reduces the combustion efficiency by limiting the permissible temperature reduction
   D. Both B. and C.

4. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?

   A. 21% excess air has been used for combustion
   B. 21% excess oxygen has been used for combustion
   C. Complete combustion of fuel has taken place
   D. No excess air has been used for combustion

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

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

6. 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

7. 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

8. 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

9. 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

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