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
Category: Fuels and Combustion Mcqs
H/C ration (by weight) for the same number of carbon atoms is the highest in the
A.paraffins
B.naphthenes
C.olefins
D.aromatics
The complete combusion of 1 pound of carbon requires
A.2.66 pounds of air
B.29 pounds of air
C.11.5 pounds of air
D.12.6 pounds of air
Butane is flammable in concentrations from
A.4.1 to 74.2 %
B.5.3 to 14.0 %
C.1.6 to 8.5 %
D.3.2 to 12.5 %
Which reaction takes place in CO boiler of fluid catalytic cracking units?
A.2CO2 ? 2CO + O2
B.2CO + O2 ? 2CO2 + energy
C.CH4 + 2O2 ? CO2 + 2H2O
D.C2H4 + 3O2 ? 2CO2 + 2H2O
How many cubic foot of air is required for the complete and perfect combustion of one cubic foot of methane
A.2.0 cu. Ft.
B.3.0 cu. Ft.
C.7.5 cu. Ft.
D.9.52 cu. Ft.
The correct amount of excess air is the amount that gives
A.the maximum fuel consumption for the given requirement
B.the high percentages of O2 in the flue gas
C.the high stack temperature
D.the most efficient furnance operation and the minimum fuel consumption for the given heating requirement
The bright glow of a combustion process is the characteristic of
A.fast and high temperature oxidation
B.slow and low temperature oxidation
C.slow and high temperature oxidation
D.fast and low temperature oxidation
Actual maximum flame temperatures for the pure combustible gases burnt in unpreheated air range from
A.1000 to 2000?F
B.2000 to 2500?F
C.2700 to 3000?F
D.3400 to 3800?F
AT a given temperature the enthalpy is the lowest for
A.CO2
B.air
C.SO2
D.H2O
