Discussion
Due to prime mover failure of synchronous generator :
Answer: B
The direction of active power flow reverses.
If the prime mover fails while the generator stays connected to the grid, it keeps running at synchronous speed, but now it draws active power from the bus to cover its losses and drive the turbine. It runs as a synchronous motor, so active power flows into the machine instead of out. Reverse power relays detect exactly this.
The reactive power exchange is set by the field excitation, which the prime mover failure does not touch, so it is not the effect the question describes. 'Relative power' is not a power-system quantity, and active power certainly does change direction.
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