Q.

Which fuel is used widely in steam power plants?

A. oil
B. gas
C. coal
D. petroleum
Answer» C. coal
Explanation: coal is the oldest form of fuel and is still used in a large scale throughout the world by steam power plants as well as all power generation plants. coal is a heterogeneous compound and its constituents are always carbon, hydrogen, oxygen, sulfur, nitrogen and certain mineral non combustibles.
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