Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

A. 60
B. 160
C. 500
D. 750

Orsat apparatus is meant for ___________________?

A. Gravimetric analysis of flue gas
B. Finding out combustion efficiency
C. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
D. None of these

The combustion reaction, C + O2 = CO2, is ___________________?

A. Exothermic
B. Endothermic
C. Autocatalytic
D. None of these

Which of the following constituents of coal is the most important in the production of coke ?

A. Moisture
B. Ash
C. Volatiles
D. Carbon

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

Quantity of coke produced from metallurgical coal may be around _____________ percent?

A. 30
B. 50
C. 75
D. 95

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?

A. 71%
C. In between 37 & 71%
D. None of these

Fussain _____________________?

A. Is friable, charcoal like substance
B. Has highest fixed carbon and lowest volatile matter content of all the four banded components
of coal
C. Is non-coking, but when blended with highly coking coal, controls its swelling and produces

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

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 low
C. If its hydrogen/hydrogen compound content is zero
D. Under no circumstances