Fuels and Combustion

A. Four
B. Five
C. Six
D. Two

A. Bituminous coal
B. Coke
C. Semi-bituminous coal
D. Anthracite

A. Vitrain
B. Clarain
C. Durain
D. Fussain

A. Decreases the dew point
B. Increases the dew point
C. Reduces the combustion efficiency by limiting the permissible temperature reduction
D. Both B. and C.

A. Decrease in its caking power & calorific value
B. Decrease in its carbon & hydrogen content
C. Increase in its oxygen content
D. All A., B. and A.

A. May damage its walls due to abrupt excessive swelling of coal
B. Produces larger size coke
C. Increases the time of carbonisation
D. None of these

CA. Provides better control of furnace temperature
B. Facilitates combustion with lower excess air
C. Provides higher thermal efficiency & flame temperature
D. All A., B. & C.

A. Its thorough mixing with air
B. Attainment of chemical equilibrium
C. Attainment of high temperature
D. None of these

A. 70
B. 85
C. 105
D. 145

A. CO2
B. CH4
C. H2
D. NH3