Engineering :: Fuels and Combustion

@ : Home > Chemical Engineering > Fuels and Combustion

41.

Which is not a combustible gas?

A.	Carbon monoxide	B.	Carbon dioxide
C.	Hydrogen	D.	Gobar gas

42.

Incomplete combustion of hydrocarbon fuels

A.	yields carbon dioxide and water vapour	B.	takes place due to too much air
C.	takes place due to an insufficient amount of air	D.	yields hydrogen and carbon dioxide

43.

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

44.

The volume of oxygen at STP required for the complete combustion of 2 litres of CO at STP is

A.	1/2 litre	B.	1 litre
C.	2 litres	D.	4 litres

45.

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

46.

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

47.

Control of incomplete combustion loss would mean

A.	decreasing the amount of excess air	B.	increasing the amount of excess air
C.	increasing the fuel/air ratio	D.	to decrease moisture loss

48.

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

49.

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%

50.

When incomplete combustion loss is excessive the flue gas analysis reveals large amount of

A.	carbon dioxide	B.	carbon monoxide
C.	oxygen	D.	carbon