The efficiency of a machine is always less than 100% because the
A.
work output is always greater than the work input
B.
load lifted is always greater than the effort applied
C.
effort applied is always greater than the load lifted
D.
velocity ratio is always greater than the mechanical advantage
Correct Answer: Option D
Explanation
In real-world machines, due to factors such as friction, deformation, and other losses, the mechanical advantage is always less than the velocity ratio:
MA < VR
This means that the work output (useful work done) is always less than the work input (energy supplied), leading to efficiency being less than 100%.
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