Always 100%
Always less than 100%
Always greater than 100%
None of these options
A machine cannot be 100 per cent efficient because the output of a machine is always less than the input. A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.
- Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
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