3019. Purity of coke means that, it is high in carbon and low in
Volatiles
Ash
Iron
Moisture
✅ The correct answer is option A.
3024. A coal having higher volatile matter content will necessarily have lower
Ash fusion temperature
Calorific value
Ignition temperature
Caking index
✅ The correct answer is option C.
2992. High excess air in combustion of fuels results in
Increased fuel consumption
Incomplete combustion
Smoky flame
None of these
✅ The correct answer is option A.
3000. 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
Is less liable to spontaneous combustion on storage
Is more difficult to ignite and produces a shorter flame
Requires smaller combustion space and less secondary air
None of these
✅ The correct answer is option D.
3005. Coking time in narrow by-product coke ovens is around __________ hours.
18
48
8
80
✅ The correct answer is option A.
3009. Number of macrocomponents present in coal according to Stopes are
Four
Five
Six
Two
✅ The correct answer is option A.
2960. Pour point of a petrofuel is
multiple of 3°F.
multiple of 5°F.
5°C below the temperature at which oil ceases to flow.
none of these.
✅ The correct answer is option C.
2962. Good quality kerosene should have
low smoke point.
high smoke point.
high aromatics content.
low paraffins content.
✅ The correct answer is option B.