Related Questions

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
A Is less liable to spontaneous combustion on storage
B Is more difficult to ignite and produces a shorter flame
C Requires smaller combustion space and less secondary air
D None of these
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 of metallurgical coke may be around __________ percent.
A 1-2
B 10-15
C 22-26
D 30-33
A good coking coal should have high __________ content.
A Ash
B Sulphur & phosphorus
C Moisture
D None of these
A coal having high volatile matter content will
A Give less yield of tar and gas on carbonisation
B Burn with a small non-smoky flame
C Have a very high calorific value
D None of these
A coal having higher volatile matter content will necessarily have lower
A Ash fusion temperature
B Calorific value
C Ignition temperature
D Caking index
A coal having higher volatile matter content, has lower
A Smoking tendency on burning
B Coke oven gas yield on carbonisation
C Chance of catching fire during storage in open space
D Ignition temperature
During coking of coal, the ash content (percentage)
A Increases
B Decreases
C Remains constant
D None of these
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

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