Final answer:
The B pumps on a HYDRAULIC B system operate automatically when the flaps are not set to zero and the opposite engine generator is operating.
Step-by-step explanation:
The B pumps on a HYDRAULIC B system operate automatically when the flaps are not set to zero and the opposite engine generator is operating. In other words, the B pumps will activate when the flaps are extended and there is electrical power from the opposite engine generator. This allows the B pumps to provide hydraulic power when needed.