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Automotive Technology Flashcards

7 cards from real NOCTI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Automotive Technology flashcards as text

  1. What is the standard operating voltage of a fully charged 12-volt automotive battery?

    Answer: 12.6 volts

    A fully charged 12-volt lead-acid battery at rest (surface charge dissipated) reads approximately 12.6 volts open circuit voltage.

  2. What is the primary function of the alternator in an automotive electrical system?

    Answer: Convert engine mechanical energy into electrical energy to charge the battery and power accessories

    The alternator is driven by the engine and uses electromagnetic induction to produce AC electricity, which is rectified to DC to recharge the battery and power vehicle systems.

  3. Which type of fuel injection delivers fuel directly into the combustion chamber rather than the intake port?

    Answer: Gasoline direct injection (GDI)

    Gasoline Direct Injection (GDI) sprays fuel directly into the combustion chamber at high pressure, improving fuel efficiency and power output.

  4. While driving, the battery warning light illuminates on the dashboard. What is the MOST likely cause?

    Answer: Alternator is not charging the battery

    The battery warning light typically indicates the charging system is not producing adequate voltage, most often due to a failing alternator, broken belt, or voltage regulator fault.

  5. What is the function of the Throttle Position Sensor (TPS)?

    Answer: Signal the ECM about throttle plate angle to calculate engine load and fuel demand

    The TPS sends a voltage signal corresponding to throttle plate position to the ECM, which uses it to determine engine load and adjust fuel injection and ignition timing.

  6. When testing a circuit with a multimeter set to DC volts and the reading shows 0 volts at a powered component, what does this MOST likely indicate?

    Answer: There is an open circuit (break) between the power source and the test point

    A 0-volt reading at a component that should have voltage indicates an open circuit, such as a blown fuse, broken wire, or failed switch, between the power source and the test point.

  7. Which component in the fuel system is responsible for maintaining consistent fuel pressure delivered to the fuel injectors?

    Answer: Fuel pressure regulator

    The fuel pressure regulator maintains a constant differential pressure across the injectors to ensure consistent fuel delivery regardless of engine load or throttle position.