Answer:
We can make the work output of a machine greater than the input by using a correct maintenance of the machine.
Explanation
All the parts of the machine has to be sized accorded to the load of the work. we can do that too reducing the friction forces of the machine system.
For example in a turbine that moves a electric generator the work input in this case the water that moves the turbine. The electric generator could do a greater work than the input. We can make this using a trifasic generator where te stator and rotor produces a big quantity of electric energy in compared of the force of the water to move the turbine. In this example we can increase the work output reducing the losses due to the copper and iron of the generator.
In conclusion, if the machine has a periodic maintenance and a has the proper size of the components we can make the output work greater than the input.
