During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?

Related Mcqs:

1. 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

2. 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

3. 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

4. Deficiency of combustion air during combustion of a gaseous fuel_____________________?

   A. Lengthens the flame
   B. Causes heat loss of fuel by its partial combustion
   C. Both A. & B.
   D. Shortens the flame

5. 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

6. Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?

   A. Sulphur
   B. Oxygen
   C. Hydrogen
   D. Carbon

7. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?

   A. 400-500
   B. 900-1000
   C. 1400-1500
   D. 1700-1800

8. 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

9. 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.

10. During combustion of gaseous fuels, deficiency of air_________________?

    A. Lengthens the flame
    B. Tends to shorten the flame
    C. Does not affect the flame length
    D. Increases the flame temperature