Question

Which of the following are the types of coal?

• A. availability of special grade silicon for making cells is limited
• B. entire process of manufacturing is very expensive
• C. efficiency is low
• D. all the above

Answer 1

The correct option is D

all the above

The coal contains solid carbon along with moisture and volatile materials.It is classified into three, they are
a) Lignite: It is brown to black in colour and has the impression of trees from which it has been formed. It has 70% carbon.
b) Bituminous: It is the most common type of coal and it burns with smokes.It has 75-80% carbon.
c) Anthracite: It is also called hard coal and has a shiny black colour.It is almost smokeless.It has 75% carbon.