Related Questions

Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
A 1000
B 4000
C 8000
D 15000
Efficient burning of anthracite coal requires
A Low preheat of air
B Fine grinding
C High excess air
D All of the above
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
Anthracite can be used for
A Recarbonising steel
B Making carbon electrodes
C Blending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke
D All of the above
Ignition temperature decreases progressively from anthracite to lignite, because
A Volatile matter content increases
B Carbon content decreases
C Moisture content increases
D Ash content increases
In a thermal power plant, coal from the coal handling plant is moved to the boiler bunker through a
A Belt conveyor
B Bucket conveyor
C Fork lift truck
D Overhead crane
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
A Entrained
B Moving
C Fixed
D Fluidised
The Appalachian coal fields, one of the important coal fields in the world, are located in ________
A China
B Great Britain
C U.S.A.
D Russia
Combustion of pulverised coal as compared to that of lump coal
A Develops a non-luminous flame
B Develops a low temperature flame
C Can be done with less excess air
D Provides a lower rate of heat release

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