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
'Fat coals' are those coals which have very high
A Caking capacity
B Volatile matter content
C Fusion point of its ash
D Inherent moisture content
Caking coals are those which
A Form lumps or masses of coke
B Burn freely
C Show little or no fusing action
D Burn completely
Highly caking coals
A Produce weak coke
B Produce strong coke
C May damage the coke oven walls during carbonisation
D Both B and C
Powdery materials can be guarded against caking tendency on storage by
A Providing irregular grain size
B Providing minimum percentage of voids
C Having maximum possible points of contact
D None of these
Assam coals suffers mainly from the disadvantage of high __________ content.
A Ash
B Volatile matter
C Sulphur (4-6%)
D Moisture
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 high amount of volatile matter
A Would require smaller combustion chamber
B Produces very little of tar and gas on carbonisation
C Ignites easily and burns with long smoky flame
D All of the above
A coal containing high amount of volatile matter will have
A Low ignition temperature
B Very little ash content
C High fusion point of its ash
D Low adiabatic flame temperature
High ash coals
A Are soft & friable (poor strength and size stability)
B Require longer time of carbonisation as ash offers resistance to heat transfer
C Produce larger quantity of coke oven gas
D None of these

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