Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?
A. Decreases the hardness of coke
B. Decreases the abrasion resistance of coke
C. Causes brittleness in steelD. None of…
Beehive coke oven________________?
A. Facilitates by-products recoveryB. Takes 2-3 days for coking of coal but requires no external fuel for heating
C. Gives larger yield of coke (around 85%) as compared to by-product ovens
Gross and net calorific value of a fuel will be the same__________________?
A. If its ash content is zero
B. If its carbon content is very lowC. If its hydrogen/hydrogen compound content is zero
D. Under no circumstances…
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?
D. None of these…
A. Is friable, charcoal like substance
B. Has highest fixed carbon and lowest volatile matter content of all the four banded components
C. Is non-coking, but when blended with highly coking…
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?
A. Carbon tetrachlorideB. Sand (40%)
C. Mineral oil of high viscosity & specific gravity (1.6)
D. None of…