RRB RPF RPSF SI and CONS Model Papers 5 with solutions

(4) Tetra ethyl lead is best anti knock compound used in petrol, which is used for controlled combustion in Petrol. Anti-Knocking agents are the additives which improve the octane value of the fuel. Addition of a very small amount of Tetra ethyl lead to petrol of low antiknock value usually increases the octane number to a very considerable extent.