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
If all the factors of productions are increased in a fixed proportion , volume of production increase proportion which is greater than the proportion of increase in the factors of production -this state can be described most appropriately by -
A Proportionate return to scale
B Disproportionate return of scale
C Increasing return to scale
D Law of scale
It all the factors of productions are increased in a fixed proportion, volume of production increase proportion which is greater than the proportion of increase in the factors of production this state can be described most appropriately by-
A Proportionate return to scale
B Disproportionate return of scale
C Increasing return to scale
D Law of scale
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
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 having higher volatile matter content will necessarily have lower
A Ash fusion temperature
B Calorific value
C Ignition temperature
D Caking index
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
Volatile matter content in coking coal may be about __________ percent.
A 1
B 7
C 22
D 46
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

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