Which would yield more energy when completely burned?
A.methane
B.ethane
C.propane
D.butane
Category: Fuels and Combustion Mcqs
The fuel ratio of coal is defined as the ratio of
A.its percentage fixed carbon to that of ash
B.its percentage fixed carbon to that of volatile matter
C.its percentage fixed carbon to that of moisture
D.percentage carbon to that of hydrogen obtained in the ultimate analysis of coal.
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
H/C ratio (by weight) is zero for
A.carbon
B.hydrogen
C.methane
D.Gobar gas
The temperature to which a substance must be heated before it may burn is called
A.flash point
B.critical temperature
C.transition temperature
D.ignifion temperature
Incomplete combustion of hydrocarbon fuels may be due to
A.presence of high percentage of carbon monoxide in the flue-gas
B.a smoky stack
C.increased fuel consumption for the same heating requirement
D.all these answers
Ignition of liquid fuel at its flash point would cause
A.no combustion
B.continuous combustion
C.no momentary flash
The most economic fuels are
A.solid fuels
B.liquid fuels
C.gaseous fuels
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
As the carbon-hydrogen ration of the fuel increases.
A.The amount of CO2 formed decreases for the same % of excess air
B.The amount of CO2 formed increases for the same % of excess air
C.the amount of energy liberated by the combustion decreasesfor the same % of excess air
D.the amount of CO2 formed remains constant for the same % of excess air.
