Critical Air Blast (CAB) value of coke is a direct measure of its__________________?
A. Reactivity
B. Hardness
C. Strength
D. None of these
Fuels and Combustion
A particular coal is said to be free burning when it __________________?
A particular coal is said to be free burning when it __________________?
A. Burns completely
B. Gives smokeless burning
C. Shows little or no fusing action
D. None of these
Ultimate analysis of coal determines its _______________ content?
Ultimate analysis of coal determines its _______________ content?
A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, ash, sulphur & nitrogen
C. Carbon, sulphur, volatile matter & ash
D. Carbon, volatile matter, ash & moisture
Higher efficiency in the combustion of solid fuel cannot be achieved by________________?
Higher efficiency in the combustion of solid fuel cannot be achieved by________________?
A. Proper fuel preparation
B. Keeg the flue gas exhaust temperature very high
C. Adopting efficient-fuel firing technique & equipment
D. Supplying correct quantity of combustion air
If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?
If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?
A. Incomplete combustion
B. Dry gas/stack gas loss
C. Moisture loss
D. None of these
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
A. Incomplete combustion
B. Complete combustion
C. High oxygen in flue gas
D. None of these
____________ process is meant for direct hydrogenation of coal to produce liquid fuel?
____________ process is meant for direct hydrogenation of coal to produce liquid fuel?
A. Fischer-Tropsch
B. Bergius
C. Lurgi
D. None of these
One kg of carbon for theoretically complete combustion requires ______________ kg of air?
One kg of carbon for theoretically complete combustion requires ______________ kg of air?
A. 11.5
B. 0.5
C. 23
D. 12
When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?
When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?
A. CO2
B. CO
C. O2
D. C
Naphthalene recovered from coke oven gas is used___________________?
Naphthalene recovered from coke oven gas is used___________________?
A. As moisture proof coating on fibres
B. As moth balls (insecticides)
C. As a fuel in furnaces
D. For making electrodes