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

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. 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

3. 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.

4. 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

5. 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

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. Ignition temperature of a fuel in air is ______________ that in pure oxygen?

   A. More than
   B. Less than
   C. Equal to
   D. Either more or less; depends on the type of fuel

8. 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

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. With increase in calorific value of fuels, their adiabatic flame temperatures__________________?

    A. Increase
    B. Decrease
    C. Remain unchanged
    D. May increase or decrease; depends on the quantity of products of combustion