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.
Related Mcqs:
- 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 - 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. - 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 - 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 - The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?
A. 1
B. < 1
C. > 1
D. Unpredictable - 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 - 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 - 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 - Which of the following has the highest theoretical flame temperature ?
A. Blast furnace gas
B. Hydrogen
C. Acetylene
D. Coke oven gas - Preheating of ______________ the flame temperature?
A. The gaseous fuel before combustion decreases
B. Combustion air decreases
C. Either the fuel or the air or both, increases
D. Either the fuel or the air does not affect
