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The driving power from the prime-mover driving the alternator is lost but the alternator remains connected to the supply network; the field supply also remains on. The alternator will
1. get burnt
2. behave as an induction motor but will rotate in the opposite direction
3. behave as a synchronous motor and will rotate in the same direction
4. behave as a synchronous motor but will rotate in a reverse direction to that corresponding to generator action

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Correct Answer - Option 3 : behave as a synchronous motor and will rotate in the same direction

In case of failure of the prime mover of the generator and the excitation is present then the generator draws power from the other parallel generator and starts working as a synchronous motor with the same direction and for this motor, the turbine is working as a load.

Because of the huge mass of the turbine the motor draws a huge amount of current which damages the winding. It will absorb power from the bus bar.

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