A. Problem of uniform heating along its height
B. Structural strength of silica bricks
C. Problem in door cleaning
D. Buckling of ram of pusher car at the time of coke pushing
Related Mcqs:
- 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. - 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 - Coke oven gas constitutes mainly of ____________________?
A. H2 & CO
B. H2 & CH4
C. CH4 & CO
D. H2 & CO2 - 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 - Traces of tar fog present in the coke oven gas is removed by_________________?
A. Cyclone separator
B. Wet packed scrubber
C. Electrostatic precipitator
D. Washing with monoethanolamine - Removal of hydrogen from coke oven gas ___________________?
A. Increases its calorific value
B. Decreases its calorific value
C. Does not alter its calorific value
D. Is not possible on commercial scale - Coking time in beehive coke oven is about ___________________?
A. 12 hours
B. 2-3 days
C. One week
D. Two weeks - Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _______________ percent?
A. 5
B. 25
C. 55
D. 75 - Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?
A. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B. Adiabatic flame temperature
C. Heat release rate (thus requiring smaller combustion chamber)
D. All A., B. and C. - Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ °C?
A. 30
B. 65
C. 120
D. 180
