A. Reduction in coal size
B. Increase in its friability
C. Decrease in its caking capacity
D. All A., B. and C.
Weathering of coal during storage causes_______________? Read More »
Fuels and Combustion A. Four
B. Five
C. Six
D. Two
Number of macrocomponents present in coal according to Stopes are ___________________? Read More »
Fuels and Combustion 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.
High sulphur content in a fuel ______________ of the flue gases? Read More »
Fuels and Combustion 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.
Low temperature oxidation of stored coal results in the________________? Read More »
Fuels and Combustion 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
High rate of heating of coke ovens____________________? Read More »
Fuels and Combustion 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.
ombustion of pulverised coal compared to the lumpy coal __________________? Read More »
Fuels and Combustion 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
