H/C ratio (by weight) is infinite for
A.carbon
B.hydrogen
C.methane
D.gobar gas
Category: Fuels and Combustion Mcqs
The proximate analysis of coal gives
A.carbon hydrogen and ash
B.volatile matter moisture ash and fixed carbon
C.carbon hydrogen sulphur and nitrogen
D.volatilematter mositure nitrogen and fixed carbon
Flue gas viscosities at temperatures TA TB and TC ?C were obtained as 0.020 x 10-3 0.030 x 10-3 and 0.040 x 10-3 kg/m-s respectively. This means that
A.TA = TB = TC
B.TA > TB > TC
C.TA < TB < TC
D.TA < TC < TB
If the oxygen concentration of flue gas is too low
A.the amount of excess air should be decreased
B.the amount of excess air should be increased
C.the amount of excess air should be kept constant
D.there is dry-gas or stack loss
Fuel combustion is never 100% efficient due to
A.incomplete combustion loss
B.dry gas loss or stack loss
C.moisture loss unaccountable loss
D.all these answers
At a given temperature the enthalpy is the highest for
A.CO2
B.air
C.SO2
D.H2O
Heating value of gaseous fuels in Btu/cu. Ft.
A.decreases with increase in molecular weight
B.increases with increase in molecular weight
C.remains constant with change in molecular weight
D.is always negative
A fuel can be defined as any combustible matter that is used to produce heat. So the fuels may be
A.solids
B.gases
C.liquids
D.all of the above
The gross heat of combustion is
A.the heat directly released by combustion
B.the heat released by cooling down all combustion products to the temperature before combustion
C.the latent heat of condensation of the water formed
D.all of these answers
