Coalification means the Process of conversion of lignite into anthracite Direct hydrogenation of coal Complete combustion of coal Underground gasification of coal TRUE ANSWER : ? YOUR ANSWER : ?
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at Singreni (AP.) Dankuni (West Bengal) Dhanbad Raniganj TRUE ANSWER : ? YOUR ANSWER : ?
Narrow coke ovens as compared to wider coke ovens Produce stronger coke Produce smaller coke All of these Require less time of carbonisation TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not applicable to fluidised bed combustion of coal? Less heat transfer surface area is required in boilers None of these It achieves higher fuel combustion efficiency It can not burn low grade coal TRUE ANSWER : ? YOUR ANSWER : ?
If oxygen content in the flue gas rises too high, fuel is being wasted by None of these Incomplete combustion Dry gas/stack gas loss Moisture loss TRUE ANSWER : ? YOUR ANSWER : ?
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be Low High None of these Very high, if the fuel is of low calorific value TRUE ANSWER : ? YOUR ANSWER : ?
During the carbonisation of coal Evolution of H₂ and formation of methane and aromatics occur at > 700°C All tar is evolved at < 600°C All of these Hard semi-coke starts shrinking at 600°C TRUE ANSWER : ? YOUR ANSWER : ?
For every 10% increase in the excess air; the fuel consumption increases by __________ percent. 5 2 0.1 10 TRUE ANSWER : ? YOUR ANSWER : ?
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms. 5 to 15 3 to 4 20 to 40 1 to 2 TRUE ANSWER : ? YOUR ANSWER : ?
__________ has the widest inflammability limit (explosion limit) of all the gases. Methane Hydrogen Carbon monoxide Acetylene TRUE ANSWER : ? YOUR ANSWER : ?