Which of the following is part of a conventional distributor?

A rotor is indeed a crucial component of a conventional distributor used in internal combustion engines. It is responsible for transferring the electrical current from the ignition coil to the correct spark plug in the ignition system. When the engine runs, the rotor spins inside the distributor cap, and as it turns, it aligns with each terminal connected to the spark plugs. This precise timing is essential for the engine's proper functioning since it ensures that the correct cylinder fires at the right moment during the combustion cycle.

The other components listed, such as the capacitor, alternator, and flywheel, serve different purposes within an engine system. A capacitor is typically associated with the ignition system but does not function within the distributor itself. An alternator generates electricity to power the electrical system and recharge the battery but is not part of the distributor. A flywheel is used to store rotational energy and maintain the engine's momentum but, again, is not a component of a distributor. This distinction highlights the rotor's specific and vital role in the operation of a conventional distributor in managing ignition timing.