Which two items are typically powered from an emergency power source in a thermal generator?

The correct answer identifies items that are critical for the operational integrity and safety of a thermal generator during an emergency situation. The turning gear and lube oil pump play vital roles in maintaining the thermal generator's performance and protecting its components.

The turning gear is essential for slowly rotating the generator's rotor when it is offline or during startup to prevent warping and damage that could occur if the rotor remains static for prolonged periods. The lube oil pump ensures that the bearings and other moving parts receive adequate lubrication, which is necessary to minimize friction and wear. In the event of a power outage or failure of the main power source, maintaining operation of these components is crucial to prevent damage and facilitate a smooth restart of the generator when power is restored.

Other options may include systems that, while important for operation, are not as immediately critical in an emergency context as the turning gear and lube oil pump. For example, control rooms require power for monitoring and management but may not directly impact the physical safety and mechanics of the generator itself in the way that the turning gear and lube oil pump do. Similarly, systems relating to fuel storage or transformers serve a different purpose and thus do not share the same level of immediate criticality.