The ration of the percentage carbon obtained in the ultimate analysis and the per cent fixed carbon obtained in the proximate analysis is always
A.one
B.less than one
C.greater than one
Category: Fuels and Combustion Mcqs
The complete and perfect combustion of a hydrocarbon fuel yields
A.carbon monoside gas and water vapour
B.carbon dioxide gas only
C.water vapour only
D.both carbon dioside gas and water vapour
If the cocentration of ethane were 3.2% (lower limit of flammability)M-S-A Explosivemeter would read
A.100%
B.50%
C.3.20%
D.32%
A reading of 100% on the explosivementer means that the concentration of combustible gas is
A.less than the lower limit of explosibility
B.equal to the lower limit of explosibility
C.higher than the lower limit of explosibility
D.both (b) and (c)
Theoretical flame temperature is the temperature attained
A.when a fuel is burned in air
B.when a fuel is burned in oxygen
C.when a fuel is burned in air or oxygen
D.when a fuel is burned in air or oxygen without gain or loss of heat
If the analysis of the flue gas revealed an oxygen content of 11% this means that
A.fuel is being wasted by incomplete combustion
B.the combustion is proceeding effieiently
C.the dry-gas loss is too great
D.the dry-gas loss is negligible
Moisture loss is determined by
A.the moisture content of the fuel
B.the humidity of air used for combustion
C.the moisture content of the fuel and the jumidity of air used for combustion
D.the water formed by combustion reaction
Explsion will not occur if the nethane concentration in air were
A.13%
B.above 14%
C.10%
D.6%
A fuel is a substance which
A.burns on heating
B.produces smoke
C.burns to produce energy
D.undergoes oxidation on heating
H/C ratio (by weight) for the same number of carbon atoms is the lowest in the
A.paraffins
B.naphthenes
C.olefins
D.aromatics
