Is there any way to predict which machine will act as a motor and which acts as a generator before applying the supply voltage?
I cannot find a way to predict what will be the behaviour(motor or generator ) of both machines after applying the external voltage source.
To me both machines in this test seems very symmetrical and we already know that for Hopkinson's test both machines should be identical. That is why I cannot find a way to predict the behaviour after applying the voltage source.
Are there any factors prior (or after) to applying voltage source which makes one of them behave as a motor and other as a generator?
Or is there not a way predict their behaviour behaviour before applying the voltage source?