Category: Fuels and Combustion

A. Percentage of ash in coke produced from medium coking coal is more than that in coal
B. The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by
cryogenic method
C. Ash is normally removed as ‘fly-ash’ in Kopper-Totzek process of coal gasification
D. Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ
Kopper-Totzek process of coal gasification

A. Burning on travelling grate
B. Coke making
C. Burning on firebars
D. All A., B. and C.

A. Nickel
B. Zinc oxide
C. Alumina
D. Thorium oxide

A. LPG
B. Coal briquettes
C. Tar
D. Colloidal fuels

A. 550
B. 750
C. 950
D. 1150

A. No possibility of obtaining complete combustion at high temperature
B. Always loss of heat from the flame
C. Both A. and B.
D. Neither A. nor B.

A. 2CO ↔ C + CO2
B. CO + H2O ↔ CO2 + H2
C. C + H2O ↔ CO + H2
D. C + 2H2O ↔ CO2 + 2H2

A. Transportation of coal
B. Drying of coal
C. Combustion of coal by supplying it around the burner
D. Preheating the primary air

A. Cokes of high reactivity are obtained from weakly coking coals
B. Cokes of high reactivity are obtained from strongly coking coals
C. Reactivity of coke is inversely proportional to its absolute density
D. Abrasion index of the coke is a measure of its hardness

A. Less volatile matter
B. More carbon
C. Greater percentage of ash
D. All A., B. and C.