What can still occur if the ignition switch remains ON while the master switch is OFF?

When the ignition switch is ON and the master switch is OFF, the engine can still turn over due to the way the electrical systems are designed in aircraft. In this scenario, the ignition system can receive power from the battery even when the master switch is not engaged, which enables the starter motor to operate and attempt to turn the engine.

The integrity of the wiring can allow for this electrical flow, meaning that the engine can attempt to crank without other systems being powered. This highlights the importance of ensuring that operational checks are conducted correctly before starting the engine to prevent any unexpected behavior.

The other choices do not hold true in this scenario. For example, with the master switch OFF, no other electrical systems or functions typically provided by the battery or generator would be operational, which is why the other options reflect behaviors that do not align with the specific circumstances outlined in the question.