28) The principal constituents of a fuel are
Answer is:
Carbon and hydrogen
Related Thermal Engineering MCQ with Answers
Answer is:
Anthracite coal
Explanation:
Anthracite, also known as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Answer is: