A. Reduces its sulphur and ash content
B. Controls its ash fusibility and increases its calorific value
C. Improves its coking properties
D. All A., B. and C.
A. Origin of petroleum oil
B. Origin of coal
C. Coalification
D. Variation of coal quality with depth
A. Colour
B. Moisture content
C. Ash content
D. Volatile matter
A. Incomplete combustion
B. Dry gas/stack gas loss
C. Moisture loss
D. All A., B. and C.
A. Fixed carbon
B. Volatile matter
C. Ash
D. Oxygen
A. Blast furnace gas
B. Natural gas
C. Producer gas
D. Water gas
A. Produces more slag when used in the blast furnace
B. Has poor strength and abrasion resistance
C. Is desirable in producer gas manufacture
D. None of these
A. Caking power
B. Calorific value
C. Hydrogen content
D. Oxygen content
A. Contains more than 90% durain
B. Contains more than 90% fussain
C. Contains mainly vitrain & clarain and is generally coking
D. Is non-coking
A. 1 to 2
B. 3 to 4
C. 5 to 15
D. 20 to 40