Tag: coal and its products
Questions Related to coal and its products
Lignite is:
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high moisture and ash content coal
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low moisture and ash content
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has the highest heating value and lowest moisture
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the hardest type of coal,
Lignite is brownish-black in color and has a carbon content around 60–70 percent, a high inherent moisture content sometimes as high as 75 percent, and an ash content ranging from 6–19 percent compared with 6–12 percent for bituminous coal.
Which of the following type of coal is having lowest carbon content and heating value.
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anthracite
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bituminous
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lignite
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all of them
A brownish-black coal with generally high moisture and ash content, and the lowest carbon content and heating value is lignite.
What chemical reaction makes biodiesel?
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transesterification
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sublimation
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polymerization
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fermentation
Which is the primary state in transformation of coal?
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Peat
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Bitumen
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Anthracite
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Lignite
The process of conversion of lignite to anthracite is called coalification or metamorphism of coal.
Coal is classified on the basis of its rank. The rank of coal denotes its degree of maturity. Vegetable matter, under the action of pressure, heat and anaerobic conditions, gets converted into different stages of coal namely:
Wood → Peat → lignite → sub-bituminous coal → bituminous coal → anthracite.
Peat is the first stage in the formation of coal.
The calorific value of lignite is about _____ kJ/g.
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90
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78
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87
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8
The calorific value of the fuel is also called as the heat value of the fuel. It is defined as the amount of heat released by burning of unit quantity of the fuel. The calorific value is an important characteristic of the fuel. The unit of measurement of the calorific value is the same as the energy.
Select the correct statement from the given:
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Peat is the most abundant rank of coal
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Peat has a heating value between 8300 and 13000 British Thermal Units per pound on a mineral-matter-free basis.
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Peat is an organic sediment.
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Peat has a carbon content of between 60 and 70%
The rank of coal is based on the degree to which the original plant material has been transformed into carbon.
Which among the following coal contains highest $\%$ of Carbon?
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Peat
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Bituminous
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Anthracite
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Lignite
The rank of coal is based on the amount of the plant converted into carbon.
The highest grade of coal, whose surface is shining and has the highest calorific value, is:
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bituminous
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peat
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anthracite
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lignite
The energy of a neutron released during a fission process should be reduced by about ______ part to convert it into a thermal neutron.
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$10^8$
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$10^9$
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$10^6$
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$10^2$
Which of the following is an optional form of energy ?
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Natural gas
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Hydrogen
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Petroleum
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Geothermal energy
Geothermal energy.