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ASVAB · Vehicle Systems

What is the purpose of the vehicle's battery?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

To store electrical energy, primarily to start the engine and power electronics when the engine is off

  1. A To lubricate the engine
  2. B To store electrical energy, primarily to start the engine and power electronics when the engine is off
  3. C To filter fuel
  4. D To cool the engine

Why this is the answer

The BATTERY stores electrical energy — primarily to provide the power to START the engine (running the starter motor) and to power electronics (lights, radio) when the engine is off. ASVAB Auto Information tests the electrical system. Once the engine runs, the ALTERNATOR takes over powering the car and recharging the battery. A typical car battery is 12 volts. A dead battery is a common cause of no-start. Knowing the battery's purpose (starting the engine, powering electronics, working with the alternator) is commonly tested.
Source: ASVAB Auto Information — Battery

Practice more questions

This question is from our ASVAB Practice Tests practice test. Take the full practice test to test your knowledge across all Vehicle Systems and other topics.

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About this topic: Vehicle Systems

Vehicle systems questions ask how the major subsystems work together — fuel, ignition, cooling, lubrication, electrical, exhaust and drivetrain — and what symptom points to which system. You do not need mechanic-level depth, just the function of each part and the common failure signs. This is one of 9 Auto Information questions on vehicle systems, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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