A. Incomplete combustion
B. Dry gas/stack gas loss
C. Moisture loss
D. All A., B. and C.
Related Mcqs:
- For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?
A. Increase
B. Decrease
C. Increase or decrease depending on the fuel type
D. Not change - Spontaneous combustion of coal on storage results due to___________________?
A. Inadequate ventilation
B. Low temperature oxidation
C. Storage in large heaps with small surface to volume ratio
D. All A., B. and C. - Use of excess of combustion air in the combustion of fuels results in__________________?
A. Heat losses
B. Long flame
C. Condensation of water vapour from the fuel gas
D. None of these - Deficiency of combustion air during combustion of a gaseous fuel_____________________?
A. Lengthens the flame
B. Causes heat loss of fuel by its partial combustion
C. Both A. & B.
D. Shortens the flame - 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 - Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain __________________?
A. CO
B. CO2
C. H2O
D. Both B. & C. - 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 - The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?
A. Fire point
B. Smoke point
C. Burning temperature
D. Kindling temperature - As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion _______________ for the same percentage of excess air?
A. Decreases
B. Increases
C. Remain same
D. May increase or decrease depending on the type of fuel - Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?
A. CO content
B. Dew point
C. CO2 content
D. O2 content
