Related Questions

Prime coking coal is always blended with medium or non- coking coal before ear-bonisation
A To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
B Because, it alone produces unreactive coke
C Both A & B
D Neither A nor B
The coking process normally mostly used in Indian oil refineries is the __________ coking process.
A Delayed
B Flexi
C Fluid
D Contact
Volatile matter content in coking coal may be about __________ percent.
A 1
B 7
C 22
D 46
During coking of coal, the ash content (percentage)
A Increases
B Decreases
C Remains constant
D None of these
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
A 6
B 18
C 28
D 36
Which of the following petrographic constituents of coal is non-coking?
A Durain
B Vitrain
C Clarain
D Fussain
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
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
A 15 to 25
B 35 to 45
C 55 to 75
D 75
Very __________ coals are completely devoid of cokability i.e, it is non coking.
A Young
B Mature
C Both A & B
D Neither A nor B
Coking time in narrow by-product coke ovens is around __________ hours.
A 18
B 48
C 8
D 80

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