ASVAB Practice Test 2025 - Free ASVAB Practice Questions and Study Guide

The correct answer is C. rotor. In a conventional distributor, the rotor is a key component that rotates inside the distributor cap and is responsible for distributing the high-voltage current from the ignition coil to the spark plugs in the firing order of the engine. The rotor's job is to make contact with the ignition points on the distributor cap and deliver the voltage needed to fire the spark plugs at the correct time.

While the other components listed may be part of an engine system, they are not typically found within a conventional distributor. The coil is responsible for generating the high voltage needed for the spark plugs, the piston moves up and down within the cylinder of an engine, and the spark plug ignites the air-fuel mixture in the combustion chamber.