Question

A mixture of theoretical air and fuel for complete combustion of fuel is called select one: a. Air-fuel mixture b. Stoichiometric mixture c. Rich mixture d. Lean mixture

Answer 1

Answer:

b. Stoichiometric mixture

Answer 2

A mixture of theoretical air and fuel for complete combustion of fuel is called b) stoichiometric mixture.

Definition:

"Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the stoichiometric mixture."

Stoichiometric mixture:

• The stoichiometric mixture is  also known as 'stoich'. The air-fuel ratio lower than stoichiometric level are called as 'rich'. The air-fuel ratio higher than the stoichiometric level are called as 'lean'.
• A stoichiometric misture is capable of burning at an increased heat and is capable of damaging high-load engine. This increased heat produced during combustion in capable of creating high pressure in the cylinder.
• Hence, stoichiometric mixtures are used only in low-load engines and are avoided in high-load engines and 'rich' mixtures are used as an alternative.