Use of preheated air for combustion of fuel in the furnace, increases the___________________?

A. Caking index
B. Mineral matter content
C. Ash content
D. Both B. and C.

A. N2
B. H2
C. CH4
D. CO2

A. Combustion
B. Nuclear fission
C. Nuclear fusion
D. All A., B. & C.

A. Coke even gas yield increases
B. Tar yield increases
C. Hydrogen percentage in the coke oven gas decreases
D. Methane percentage in the coke oven gas increases

A. Is non-coking
B. Has a high volatile matter content and burns with a luminous smoky flame
C. Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is
so named
D. All A., B. and C.