Q. The ratio of the indicated thermal efficiency to the air standard efficiency is known as

A
Mechanical efficiency
B
Overall efficiency
C
Relative efficiency
D
Volumetric efficiency
Solution:

Relative efficiency is the ratio of the indicated thermal efficiency to the air standard efficiency whereas overall efficiency is the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time and mechanical efficiency is the ratio of the brake power to the indicated power.

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