The hottest part of the flame lies in its _______________ zone?

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. 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

4. Short/intense flame is produced during combustion of gaseous fuel by using________________?

   A. High amount/current of combustion air
   B. Low amount/current of combustion air
   C. Preheated secondary air
   D. Very little excess air

5. Which of the following has the highest flame velocity ?

   A. H2
   B. CO
   C. CH4
   D. C2H6

6. 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

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. 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.

9. 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

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