The indicated horsepower is 75, but only 65 horsepower is delivered at the driving wheels. What is the mechanical efficiency? Express the answer to the nearest whole percent.
A) 68%
B) 70%
C) 75%
D) 87%

Question

Quizplus · Accepted Answer

Mechanical efficiency is the ratio of output power to input power. In this case, the output power is 65 hp and the input power is 75 hp. So, the mechanical efficiency is (65/75) x 100 = 86.67%, which is closest to 87%. Therefore, the best choice is D.

The Indicated Horsepower Is 75, but Only 65 Horsepower Is