With no excess air flue gas from the complete and perfect combusion of methane world contain
A.11.7% N2 and 88.3% CO2 by volume
B.11.7% CO2 and 88.3% N2 by volume
C.24.8% CO2 and 75.2% N2 by volume
D.24.8% N2 and 75.2% CO2 by volume
Category: Fuels and Combustion Mcqs
Ignition of liquid fuel at its fire point would cause
A.continuous combustion
B.a momentary flash
C.no combustion
The potassium hydroxide solution absorbs
A.CO2 as well as CO
B.CO2 as well as O2
C.CO2 O2 and CO
D.CO2 as well as SO2
With in the range of _______ of oxygen in the flue gas the combustion has enough excess air to minimize incomplete combustion and not to much excess air to cause excessive dry-gas or stack loss
A.15 to 20%
B.2.5 to 3.5%
C.15 to 30%
D.10 to 30%
What is the explosive range for hydrogen
A.4.1 to 74.2 %
B.5.3 to 14.0 %
C.3.2 to 12.5 %
D.2.1 to 9.4 %
Too much excess air gives
A.high percentages of O2 in the flue gas
B.high stack temperature
C.increased fuel consumption for the same heating requirement
D.all these answers
One of the products formed by combustion of the hydrocarbon fuels is water which is in the
A.solid state
B.liquid state
C.gaseous state
D.solid liquid and gaseous states
Under actual combustion conditions unless there is sufficient excess air the flue gas contains
A.carbon monoxide
B.carbon dioxide
C.oxygen nitrogen
D.all of these answers
If the oxygen is entirely removed from a fire by smothering it with foram the combustion will
A.slow down
B.stop entirely
C.speed up
D.not be affected at all
The combustion process is usually accompanied by
A.rise in temperature and fall in pressure
B.rise in temperature and pressure
C.fall in temperature and pressure
D.fall in temperature and rise in pressure
