Question

The ratio of the actual weight of air induced by the engine in the intake stroke to the theoretical weight of air that should have been induced due to piston displacement at intake temperature and pressure is known as ___________

(a) Efficiency ratio

(b) Volumetric efficiency

(c) Mechanical efficiency

(d) Indicated thermal efficiency

This question was addressed to me in class test.

The query is from Working Principles of I.C Engine in portion Internal Combustion Engine of Farm Machinery

Answer 1

Right option is (b) Volumetric efficiency

The explanation: Efficiency ratio is the degree by which the actual thermal efficiency approaches the ideal cyclic efficiency. Mechanical efficiency is the ratio of power delivered by the engine to the total power developed within the engine. An indicated thermal efficiency show what fraction of the heat is supplied is converted into indicated work.