1 Classify fuels on the basis of origin. Give examples. What are the characteristics of a good fuels?
Answers
Answer:
Fuel is any material that on reaction with any substance releases energy as heat energy or the material can be used for work. In other words, we can say any substance which on combustion produces a usable amount of energy is known as fuel.
EXPLANATION:-
Generally, fuels can be classified into two factors:
Based on their physical state, i.e. based on the state they are available in nature. These are further classified into three states shown below:
-Solid fuel: These are found in their solid state at room temperature, for example, coal, wood, etc. Solid fuels are easy to transport and store and also have a low production cost. But in the case of solid fuel, there is a large wastage of energy. Their cost of handling is also high.
-Liquid fuel: They are found in their liquid state at room temperature and they are mostly derived from the fossilized remains of dead plants and animals. They have a high calorific value per unit mass and burn without ash. But the cost of liquid fuel is higher as compared to solid fuels and examples of liquid fuel are coal tar, petroleum, alcohol, etc
-Gaseous fuel: This type of fuel occurs in nature, besides being manufactured from solid and liquid fuels. They require a large storage tank and are clean after use. Example of gaseous fuels are coal gas, producer gas, oil gas, etc
-Based on their occurrence they are classified as natural and artificial fuel. Wood, natural gas and petroleum are the example of natural fuel whereas coal tar, producer gas tanbark are the example of artificial fuels.
I hope this will help you
Answer:
Fuels are classified on the basis of their occurence in the nature, they are either natural or artificial. Natural fuels occur in the nature, while artificial fuels are prepared by processing the natural fuels in laboratories, they are also known as secondary fuels.
Characteristics of good fuels are as follows:
1• It should have a high calorific value
2• It should have moderate ignition temperature.
If low, it may burst into flames quickly, if too high, then difficult to burn and general usage would not be possible.
3• It should not release harmful substances during combustion for eg. carbon monoxide, which is a very poisonous gas produced during incomplete combustion.
4• Moderate rate of combustion.
5• Easily available, abundant quantity.
6• Affordable
7• Easy to handle and transport.
Hope this helps :)