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.
Related Mcqs:
- Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?
A. 60
B. 160
C. 500
D. 750 - Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?
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 - Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?
A. Colour
B. Moisture content
C. Ash content
D. Volatile matter - During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?
A. Density
B. Porosity
C. Electrical resistivity
D. None of these - 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 - Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?
A. 1000
B. 4000
C. 6000
D. 8000 - Calorific value of coke oven gas is around ______________ Kcal/Nm3?
A. 900
B. 4200
C. 7500
D. 2000 - Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the_______________?
A. Hot scarfing of steel slabs
B. Mixing with blast furnace gas
C. Coke oven battery heating
D. Steel ladle drying - Coke oven gas compared to blast furnace gas is________________?
A. More explosive and inflammable
B. Less poisonous
C. Lighter
D. All A., B. and C.
