Fuels

Question 1 Name the unit in which calorific value of a fuel is expressed?

Question 2 Name few solid fuels?

Question 3 Name few liquid fuels?

Question 4 Name few gaseous fuels?

Question 5 Define the term calorific value of fuels?

Question 6 What are the characteristics of ideal fuel?

Question 7 The calorific value of LPG is 55000 KJ/Kg.What does it mean?

A material which is burnt to produce heat is called a fuel.

For Ex:Wood,coal,LPG,Kerosene,petrol,diesel,natural gas,biogas.

A fuel is a very good source of heat.The heat energy produced by burning a fuel can be used directly to cook food,for running motor vehicles and factory machines,can be converted into electrical energy at thermal power stations.

There are 3 types of fuels:

1)Solid Fuels:Wood,charcoal,coal,coke,cow-dung cakes.

2)Liquid Fuels:Kerosene,petrol,diesel,alcohol.

3)Gaseous fuels:Coal gas,natural gas

Calorific value of fuel

Different fuels produce different amounts of heat on burning.

The amount of heat produced by the complete burning or combustion of 1Kilogram of a fuel is called its calorific value.

The calorific value of a fuel is expressed in the unit of Kilojoules per kilogram.

For Ex:The calorific value of kerosene is 45000KJ/Kg  means when 1Kg of kerosene is burned completely then 45000 KJ of heat energy is produced.

The calorific value of a fuel is also known as heat value.

The calorific value of LPG is 55000KJ/Kg  means when 1Kg of LPG is burned completely then 55000 KJ of heat energy is produced.

The calorific value of LPG is much higher than the calorific value of cow-dung cakes and coal.This means that burning of a given amount of LPG will produce much more heat than burning the same amount of cow-dung cakes or coal.

Characteristics of ideal fuel

1)It has a high calorific value

2)It burns easily in air at a moderate rate

3)It has proper ignition temperature

4)It does not produce any harmful gases or leaves any residue after burning

5)It is cheap,readily available,easy to transport.

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