Tag: mineral coal
Questions Related to mineral coal
What is the percentage of ash content in Indian coal?
-
5%
-
10%
-
20%
-
30%
The ash content of indian coal is 30℅. Initially in 1970s it was 28℅. The quality of Indian coal is deteriorating over the years. However Sulphur content of Indian coal is low about 0.5℅.
What is pulverised coal?
-
Non smoking coal
-
Coal free from ash
-
Coal broken into fine particles
-
Coal which burns for long time
Coal is a black coloured sedimentary rock. When coal is grounded or broken into fine particles using a device called powdered coal mill, the resultant coal obtained is called powdered coal or pulverized coal. It is used in cosmetics, for the generation of electricity etc.
On which factor does the calorific value of coal depend on?
-
Ash content
-
Size of coal particles
-
Moisture content
-
Volatile material
The calorific value of the coal depends upon its ash content. Less the
ash content present, more is the calorific value of the fuel i.e. the fuel
which has less ash content produces more energy on burning. Higher the
calorific value, more is the efficiency of the fuel.
In India, about ______ % of total power is generated by using nuclear energy.
-
2
-
3
-
4
-
6
Bituminous is a:
-
the most common form of coal
-
most widely used in the United States
-
a soft, intermediate grade of coal
-
all of these
Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt. It is of higher quality than lignite coal but of poorer quality than anthracite and has a high heating (Btu) value . Formation is usually the result of high pressure being exerted on lignite. Bituminous coal is an organic sedimentary rock formed by diagenetic and sub metamorphic compression of peat bog material. Its primary constituents are macerals: vitrinite, and liptinite. The carbon content of bituminous coal is around 60–80%; the rest is composed of water, air, hydrogen, and sulfur.
___________ is a brownish-black coal with generally high moisture and ash content, and the lowest carbon content.
-
bituminous
-
lignite
-
anthracite
-
sub-bituminous
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. The energy content of lignite ranges from 10 to 20 MJ/kg (9–17 million BTU per short ton) on a moist, mineral-matter-free basis.
Lignite is:
-
high moisture and ash content coal
-
low moisture and ash content
-
has the highest heating value and lowest moisture
-
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.
-
anthracite
-
bituminous
-
lignite
-
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?
-
transesterification
-
sublimation
-
polymerization
-
fermentation
Which is the primary state in transformation of coal?
-
Peat
-
Bitumen
-
Anthracite
-
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.