Question

The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called ______________

(a) mechanical efficiency

(b) overall efficiency

(c) relative efficiency

(d) volumetric efficiency

The question was asked during an interview.

I'd like to ask this question from Engine Efficiencies in portion Measurements and Testing/Performance Parameters and Characteristics of IC Engine

Answer 1

The correct answer is:

(d) volumetric efficiency

Volumetric efficiency is the ratio of the volume of air or fuel-air mixture admitted into the cylinder at N.T.P. (Normal Temperature and Pressure) to the swept volume of the piston. It measures how effectively an engine fills its cylinders with the air-fuel mixture, which directly impacts engine power and efficiency. A higher volumetric efficiency indicates better filling and, consequently, better engine performance.