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Electrical/Electronic Systems Flashcards

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

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  1. A voltage drop test across a closed switch reads 1.2 volts. What does this indicate?

    Answer: Excessive resistance in the switch contacts

    A voltage drop greater than about 0.1V across a closed switch indicates unwanted resistance from corroded or burnt contacts.

  2. Which instrument is best for measuring parasitic (key-off) battery drain?

    Answer: Ammeter in series with the disconnected battery cable

    An ammeter placed in series in the battery circuit measures the actual current drawn while the vehicle is off.

  3. A relay has terminals 85, 86, 87, and 30. Which two terminals are the control (coil) side?

    Answer: 85 and 86

    Terminals 85 and 86 energize the relay coil, while 30 and 87 carry the switched load.

  4. Total resistance in a parallel circuit is always:

    Answer: Less than the smallest individual resistor

    Adding parallel paths gives current more routes, lowering total resistance below the smallest branch.

  5. An alternator's diodes are responsible for:

    Answer: Converting AC voltage to DC

    The diode rectifier bridge converts the stator's alternating current into direct current for the vehicle.

  6. A technician finds 12.6 volts at rest and 14.2 volts with the engine running. This indicates:

    Answer: A properly charging system

    Charging voltage in the 13.5–14.7V range with a full 12.6V resting battery indicates normal charging.

  7. Which condition would cause a continuously blown fuse immediately after replacement?

    Answer: A direct short to ground in the circuit

    A dead short to ground creates excessive current that instantly blows the fuse again.