Fuels and Combustion

1

Which of the following combustibles is absent in blast furnace gas ?

A. H2
B. CH4
C. CO
D. none of these

2

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

A. H2
B. CH4
C. CO2
D. N2

3

Which of the following has the highest flame speed ?

A. CO
B. H2
C. CH4
D. C2H6

4

Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contai

A. CO
B. CO2
C. H2O
D. both(b) & (c)

5

A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is

A. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
C. CO2 : 6.39, CO : 1.60, O2: 3.99, H2O:25.96, N2:72.06
D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74