Question

The thermal efficiency of an internal combustion engine varies( )
a.Inversely as sfc
b.Directly as sfc
c.As square as sfc
d. As root sfc​

Answer 1

Answer:

A

Explanation:

Modern gasoline engines have a maximum thermal efficiency of about 20% to 35% when used to power a car. ... At high speeds, efficiency in both types of engine is reduced by pumping and mechanical frictional losses, and the shorter period within which combustion has to take place.