Category: Fuels and Combustion

A. Speed of the fan
B. Damper
C. Variation in the pitch of the fan blades
D. All A., B. and C.

A. High caking index
B. Low fusion point of ash
C. High volatile matter content
D. Very low ash content (8-10%)

A. 850
B. 1800
C. 4200
D. 6500

A. Supply of excess fuel
B. Supply of excess air
C. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying
more air
D. None of these

A. CO (upto 65%) & CO2
B. CO2 & H2
C. CO & O2
D. CO2 & O2

A. Facilitates by-products recovery
B. Takes 2-3 days for coking of coal but requires no external fuel for heating
C. Gives larger yield of coke (around 85%) as compared to by-product ovens
D. Produces coke with very poor strength

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on the type of fuel

A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, ash, sulphur & nitrogen
C. Carbon, sulphur, volatile matter & ash
D. Carbon, volatile matter, ash & moisture

A. Coke
B. Anthracite
C. Coal having low fusion point of its ash
D. Coal having high fusion point of its ash

A. M = 1.8 A
B. M = 0.5 A
C. M = 1.1 A
D. M = A