Question

Select the features of an ideal machine.

• A. Parts of ideal machine are frictionless.
• B. There is no wastage of energy in an ideal machine.
• C. The efficiency of an ideal machine is $100\%$.
• D. All of the above.

Answer 1

The correct option is D All of the above.

An ideal machine is a machine whose parts are frictionless so that there is no dissipation of energy in any manner. Its efficiency is $100\%$, i.e. the work output is equal to the work input.
Ideal machine is originally a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, etc.