Practice question

What is the primary function of the alternator in a vehicle's electrical system?

To drive the starter motor pinion gear during starting
To charge the battery and supply electrical power while the engine is running
To convert direct current (DC) from the battery into high voltage for spark plugs
To measure the speed of the engine water pump belt

Answer: B — To charge the battery and supply electrical power while the engine is running

The correct answer is shown above. Try the full quiz for additional practice.