Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in___________________?

Related Mcqs:

1. The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?

   A. Theoretically required amount of air
   B. More than theoretically required amount of air
   C. Less than theoretically required amount of air
   D. Theoretically required amount of oxygen

2. 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

3. The maximum adiabatic flame temperature in air is _____________ the maximum flame temperature in pure oxygen?

   A. Lower than
   B. Higher than
   C. Same as
   D. Not related to

4. 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

5. Actual flame temperature is always lower than the adiabatic flame temperature, because there is________________?

   A. No possibility of obtaining complete combustion at high temperature
   B. Always loss of heat from the flame
   C. Both A. and B.
   D. Neither A. nor B.

6. Adiabatic flame temperature of a fuel is dependent on the initial temperature of___________________?

   A. Fuel
   B. Air
   C. Both A. & B.
   D. Neither A. nor B.

7. Which of the following has the highest theoretical flame temperature ?

   A. Blast furnace gas
   B. Hydrogen
   C. Acetylene
   D. Coke oven gas

8. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?

   A. Low
   B. High
   C. Very high, if the fuel is of low calorific value
   D. None of these

9. Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?

   A. 20
   B. 12.5
   C. 0
   D. 10

10. 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