A. Lengthens the flame
B. Tends to shorten the flame
C. Does not affect the flame length
D. Increases the flame temperature
Related Mcqs:
- 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 - Use of excess of combustion air in the combustion of fuels results in__________________?
A. Heat losses
B. Long flame
C. Condensation of water vapour from the fuel gas
D. None of these - 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 - During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
A. Incomplete combustion
B. Complete combustion
C. High oxygen in flue gas
D. None of these - C.V. (kcal/Nm3) of gaseous fuels _____________ with increase in molecular weight?
A. Decreases
B. Increases
C. Remain constant
D. May increase or decrease, depends on combustibles - Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?
A. Producer gas
B. Carburetted water gas
C. Natural gas
D. Liquefied petroleum gas - Which of the following gaseous fuels is likely to have the highest gross calorific value ?
A. Sewage gas
B. LPG
C. Producer gas
D. Natural gas - Which of the following gaseous fuels has the lowest calorific value ?
A. Gobar gas
B. Refinery gas
C. Converter gas
D. Blast furnace gas - Combustion reaction of fuels is a/an ______________ reaction?
A. Auto catalytic
B. Exothermic
C. Endothermic
D. None of these - High excess air in combustion of fuels results in____________________?
A. Increased fuel consumption
B. Incomplete combustion
C. Smoky flame
D. None of these
