What is Fuel Rating

Fuel Those Combustion Substance Which Produce huge amount of energy after complete combustion are called Fuel.

Fuel are of two types:-

1. Primary Fuel
2. Secondary Fuel

• Primary Fuel Those combustion substance which are obtained From nature and are directly used Fuel are called primary Fuel Explain – Wood natural Gas
• Secondary Fuel– Those Combustible Substance Which are produced From primary Fuel and used as a Fuel are called Secondary Fuel . L.P.G., Petrol, Diesel, Koil, Wax, Alcohol,

On the basic of State Fuel are of three types

1. Solid Fuel
2. Liquid Fuel
3. Gaseous Fuel

What is Fuel Rating

Fuel Rating  Fuel used in automobile vehicle differ widely  in their ability to resist knock engine knocking is due to severity in operation condition is based upon engine load speed spark advance air-fuel ratio and temperatures different means used to compare the anti knock quality of the fuel standard engine  operating under given condition are use to determine fuel rating fuel are generally determined by comparing the performance of standard fuel a standard  fuel is combination mixture of iso octane and normal heptane or iso octane and tetra ethyl lead (T.E.L)

Cetane number

cetane number it is the method of rating diesel fuel valve of cetane number of particular diesel fuel is determined by comparing the ignition characteristic of fuel with refence fuel two reference fuel mixture sample of cetane and alphamethy   nephelane has poor ignition quality cetane number of sample fuel is the percentage of cetane available in the mixture of cetane and a lphamethyle  nepthelena of which ignition quality coincide

Octane number 

octane number  octane number measure the ability of petrol to resist defonation during combustion actually octane number indicates the antiknock quality of fuel these number was introduced by C.F.R> co-operative fuel research committee in this method of rating two fuel mixture hydrocarbnb is used one has worst antiknock property n- heptane and other has best antiknock property iso- octane these two are called reference fuel

n-heptane- o (zero)  octane number

iso-octane- 100 octane number

he much the knock characteristic of sample fuel with sample mixture fuel of reference hydrocarbon

What Are the Important Properties of a good Fuel:-

1. Fuel should have High Calorific Value
2. It should have optimum ignition Temp
3. It Does not produce any harmful gases
4. it should be easy to handle and transport
5. it does not leave much residue after combustion