ASVAB Mechanical Comprehension Practice Test 740104

Question 1 of 5
Efficiency

The efficiency of a machine describes how much of the power put into the machine is turned into movement or force. A 100% efficient machine would turn all of the input power into output movement or force. However, no machine is 100% efficient due to friction, heat, wear and other imperfections that consume input power without delivering any output.

What is the efficiency of a machine has work input of 60 ft⋅lb and work output of 36 ft⋅lb?
40%
60%
15%
30%