A fire can be put out by
A.cutting off the supply of combustible fuel
B.smothering the fire
C.cooling the fire
D.all of the above
Category: Fuels and Combustion Mcqs
Combustion requires
A.a supply of oxygen
B.a combustible fuel
C.a source of heat energy
D.all of the above
Excess air is to be supplied for combustion to be complete due to
A.its incomplete mixing
B.obstruction of inert gas molecules
C.chemical equilibrium
D.all of the above
The maximum adiabatic flame temperature is attained when the fuel is burned with
A.the theoretically required amount of air
B.the theoretically required amount of pure oxygen
C.more than the theoretically required amount of pure oxygen
D.less than the theoretically required amount of pure oxygen
If the O2 concentration of the flue gas rises too high fuel is being wasted by
A.incomplete combustion
B.dry-gas or stack loss
C.moisture loss
D.none of these answers
Which is not a combustible gas?
A.Carbon monoxide
B.Carbon dioxide
C.Hydrogen
D.Gobar gas
Which would give the greater amount of heat per cubic foot?
A.Hydrogen
B.Carbon monoxide
C.Hydrogen sulphide
D.Methane
Flue gas thermal conductivities at temperature TA TB and TC ?C were obtained as 0.020 0.030 and 0.040 Btu/(hr. ft2 ?F/ft) respectively. This means that
A.TA = TB = TC
B.TA < TB < TC
C.TA > TB > TC
D.TA > TC > TB
When incomplete combustion loss is excessive the flue gas analysis reveals large amount of
A.carbon dioxide
B.carbon monoxide
C.oxygen
D.carbon
