Related Questions

The hard coke is obtained when carbonization of coal is carried out at
A 500° to 700°C
B 700° to 900°C
C 300° to 500°C
D 900° to 1100°C
Carbonization of coal is the process of
A Pulverizing coal in inert atmosphere
B Heating wood in a limited supply of air at temperatures below 300°C
C Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D Binding the pulverized coal into briquettes
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
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
__________ of the coal is the basis for Seylor's coal classification.
A Proximate analysis
B Ultimate analysis
C Caking index
D Calorific value
Which of the following types of coal represents the first stage of formation of coal?
A Anthracite
B Lignite
C Peat
D Bituminous

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