A. May damage its walls due to abrupt excessive swelling of coal
B. Produces larger size coke
C. Increases the time of carbonisation
D. None of these
Related Mcqs:
- Narrow coke ovens as compared to wider coke ovens_________________?
A. Produce smaller coke
B. Produce stronger coke
C. Require less time of carbonisation
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 made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?
A. Less reactive
B. Stronger
C. Smaller in size
D. All A., B. & C. - 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 - Flue gas from the heating chamber of by product coke ovens is removed by________________?
A. Forced draft fan
B. Induced draft fan
C. Steam ejector
D. Natural draft - Gross heating value of coal is ______________ the net heating value?
A. Higher than
B. Lower than
C. Same as
D. None of these - Gross heating value of coal is ______________ the net heating value?
A. Higher than
B. Lower than
C. Same as
D. Either A. or B.; depends on the type of coal - Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?
A. 2.5
B. 0.5
C. 10
D. 20 - High amount of sulphur and phosphorous in coke causes ____________________ ?
A. Decrease in its calorific value
B. Increase in its strength
C. Brittleness of steel made by using it
D. None of these
