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

Related Mcqs:

1. 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

2. 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.

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

   A. Air
   B. Oxygen
   C. Either A. or B.
   D. Either A. or B. without gain or loss of heat

4. 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.

5. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?

   A. 1
   B. < 1
   C. > 1
   D. Unpredictable

6. 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

7. 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

8. The maximum adiabatic flame temperature in air as compared to that in pure oxygen is_______________?

   A. Much lower
   B. Much higher
   C. Same
   D. Either lower or higher, depends on the type of fuel

9. 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

10. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?

    A. Calorific value of the fuel
    B. Flame temperature achieved
    C. Speed of combustion of fuel
    D. Heat transfer rate to the stock in the furnace