A. Answer the following questions in brief :
1. What is fuel?
2. Define fossil fuels.
3. What do you mean by combustion?
4. What are the renewable sources of energy?
5. Define the calorific value.
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1. A fuel is any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work.
2. a natural fuel such as coal or oil, that was formed millions of years ago from dead animals or plants in the ground
3. Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen.
4. Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, including carbon neutral sources like sunlight, wind, rain, tides, waves, and geothermal heat
5. The heating value of a substance, usually a fuel or food, is the amount of heat released during the combustion of a specified amount of it.
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