Question

The efficiency of a machine is never 100% Give reason

Answer 1

As per the rule of conservation of energy, energy can neither be created nor destroyed but it changes its form from one form to another. This concept is applicable everywhere and here also, when engine work then heat energy converted into mechanical energy but due to some factor all heat energy not converted to mechanical energy and due to this effect transfer of energy to work not reach properly. So, we say no engine is 100% efficient.

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Answer 2

The efficiency of a machine can never be 100%. as some energy is lost in friction and some because of mass. Machine must be massless and frictionless to have efficiency 100%

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