A. Facilitate easy discharging of coke as it swells during carbonisation
B. Facilitate uniform heating of the oven
C. Increase the output of the coke
D. None of these
Related Mcqs:
- Coke oven gas burns with a yellowish flame, because of the presence of __________________?
A. CO2
B. CH4
C. H2
D. NH3 - Blast furnace gas compared to coke oven gas has_________________?
A. Lower ignition temperature
B. Narrower limit of inflammability
C. Higher calorific value
D. Lower theoretical flame temperature - Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?
A. Higher calorific value
B. Lower hydrogen content
C. Both A. and B.
D. Neither A. nor B. - Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?
A. 30
B. 300
C. 3,000
D. 30,000 - Ammonia content in raw coke oven gas is about _____________ gm/Nm3?
A. 1
B. 5
C. 50
D. 100 - Calorific value of coke oven gas is around ______________ Kcal/Nm3?
A. 900
B. 4200
C. 7500
D. 2000 - Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
A. Ammonium sulphate
B. Ammonium nitrate
C. Ammonium phosphate
D. None of these - With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases?
A. Hydrogen
B. Methane
C. Unsaturated hydrocarbons
D. All A., B. and C. - Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?
A. Prevention of clinker formation in the oven
B. Controlling the dust nuisance while charging the coal
C. Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO &
H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)
D. All A., B. and C. - Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?
A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its calorific value tremendously
C. It reduces its flame temperature tremendously
D. There are chances of explosion during preheating
