A. Reduces its ash & sulphur content
B. Improves its coking properties
C. Increase the fusion point of its ash by removing chlorine compounds
D. All A., B. and C.
Related Mcqs:
- 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 - The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?
A. Carbon tetrachloride
B. Sand (40%)
C. Mineral oil of high viscosity & specific gravity (1.6)
D. None of these - Washing of coal decreases its_________________?
A. Caking index
B. Mineral matter content
C. Ash content
D. Both B. and C. - Washing of coal does not reduce its______________________?
A. S & P content
B. Heating value
C. Fusion point of ash
D. None of these - Washing of coal is done to reduce the_________________?
A. Inherent impurities
B. Adhering impurities
C. Mineral matter
D. Both B. and C. - Cannel coal and boghead coal are the examples of _________________?
A. Humic coals
B. Liptobiolites
C. Sapropelic coals
D. None of these - 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 - 64-132) rank coal (ASTM) means a coal with 64%___________________?
A. Fixed carbon and having a heating value around 13, 200 BTU/1b
B. Ash and heating value around 13, 200 BTU/1b
C. Fixed carbon and heating value around 132 BTU/1b
D. None of these - A coal containing very high percentage of durain is called ______________ coal?
A. Bright
B. Splint
C. Non-banded
D. Boghead - Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?
A. Hydrogenation
B. Gasification
C. Carbonisation
D. None of these
