A. Washing fine coal dust (< 0.5 mm size)
B. Washing lump coal (> 80 mm size)
C. Removing ash from the coal based on difference in specific gravity of coal and ash
D. All A., B. and C.
Related Mcqs:
- Caking coal is desirable for_________________?
A. Burning on travelling grate
B. Coke making
C. Burning on firebars
D. All A., B. and C. - The main drawback of supplying more excess air in the combustion of fuel is the_________________?
A. Excessive power requirement of air blower
B. Enhanced sensible heat loss in the flue gas
C. Intermittent and uncontrolled combustion of the fuel
D. High exit flue gas temperature from the furnace - Percentage of carbon monoxide in blast furnace gas may be around ____________________ ?
A. 8
B. 14
C. 22
D. 52 - Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?
A. Its thorough mixing with air
B. Attainment of chemical equilibrium
C. Attainment of high temperature
D. None of these - The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?
A. Theoretically required amount of air
B. More than theoretically required amount of air
C. Less than theoretically required amount of air
D. Theoretically required amount of oxygen - The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be_________________?
A. 21
B. 77
C. 79
D. 29 - The internal energy of the combustion products is ____________________ compared to that of reactants?
A. More
B. Less
C. Equal
D. More or less; (depends on the state of fuel.) - Fuel for a fast breeder nuclear reactor is____________________?
A. Plutonium
B. Uranium
C. Radium
D. Neptunium - Abel apparatus is used for those oils, whose flash points are ___________°F?
A. < 120
B. > 120
C. > 280
D. 300-600 - Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?
A. It contains large amount of volatile matter
B. It is stored in tall heaps
C. Smaller fines are stored in large quantity
D. All A., B. and C.
