A. Carbon monoxide
B. Hydrocarbons
C. Hydrogen
D. Oxygen
Related Mcqs:
- Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?
A. 400-500
B. 900-1000
C. 1400-1500
D. 1700-1800 - Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its calorific value tremendously
C. It reduces its flame temperature tremendously
D. There are chances of explosion during preheating - Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
A. CO
B. CO2
C. H2O
D. Both B. & C. - Short/intense flame is produced during combustion of gaseous fuel by using________________?
A. High amount/current of combustion air
B. Low amount/current of combustion air
C. Preheated secondary air
D. Very little excess air - Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?
A. Sulphur
B. Oxygen
C. Hydrogen
D. Carbon - If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?
A. Low
B. High
C. Very high, if the fuel is of low calorific value
D. None of these - A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?
A. Presence of large quantity of hydrogen in the fuel
B. Low calorific value of the fuel
C. High sulphur content in the fuel
D. Lack of thorough mixing of fuel with air - Preheating of a gaseous fuel results in increased____________________?
A. Flame length
B. Flame temperature
C. Quantity of flue gas
D. Ignition temperature - During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
A. Incomplete combustion
B. Complete combustion
C. High oxygen in flue gas
D. None of these - “Overfire burning” in a furnace is a phenomenon characterised by the __________________?
A. Supply of excess fuel
B. Supply of excess air
C. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying
more air
D. None of these
