Practice Exam Questions And Correct

ASE A6 Electrical/Electronic Systems Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following tools is best for measuring current in a circuit?
• Voltmeter
• Ohmmeter
• Ammeter
• Multimeter (set to voltage)

Rationale: An ammeter is specifically designed to measure current in

amperes, and it must be connected in series with the circuit.

• What does a diode allow in an electrical circuit?
• Current to flow in both directions
• Current to flow in one direction 1 / 4

• Voltage amplification
• Current regulation

Rationale: A diode is a semiconductor device that permits current flow in

only one direction, blocking it in the opposite direction.

• What is the purpose of a fuse in an automotive electrical system?
• To increase current
• To protect the circuit from overcurrent
• To regulate voltage
• To store energy

Rationale: Fuses are designed to break the circuit if current exceeds a safe

level, preventing damage to components.

• Which type of relay is most commonly used to control high-current

circuits with a low-current signal?

• Solid-state relay
• Thermal relay
• Electromechanical relay
• Time-delay relay

Rationale: Electromechanical relays allow a low-current circuit to control a

high-current circuit safely using an electromagnetic switch.

• When testing a vehicle battery, which reading indicates a fully charged

12-volt battery?

• 10.5 volts 2 / 4

• 11.0 volts
• 12.6 volts
• 13.8 volts

Rationale: A fully charged 12-volt lead-acid battery should measure

approximately 12.6 volts at rest.

6. A PTC (Positive Temperature Coefficient) thermistor is used to:

• Conduct current better at higher temperatures
• Limit current as temperature rises
• Measure voltage drop
• Store electrical energy

Rationale: PTC thermistors increase resistance as temperature rises,

limiting current flow and protecting circuits.

• Which component converts AC to DC?
• Capacitor
• Transformer
• Rectifier
• Inductor

Rationale: Rectifiers, often made of diodes, allow current to flow only in

one direction, converting AC to DC.

• What is the function of a capacitor in an electrical circuit?
• Convert AC to DC
• Store electrical energy temporarily 3 / 4

• Regulate current
• Reduce resistance

Rationale: Capacitors store electrical energy in an electric field and release

it when needed.

9. When a multimeter is set to measure resistance, the circuit must be:

• Fully charged
• Operating under load
• De-energized
• Connected to a battery

Rationale: Measuring resistance requires the circuit to be de-energized to

prevent damage to the meter and inaccurate readings.

• Which automotive system primarily uses CAN bus communication?
• Mechanical braking system
• Engine and electronic modules
• Manual transmission
• Tire pressure system only

Rationale: The Controller Area Network (CAN) bus allows ECUs in engine

and electronic systems to communicate efficiently.

• What is the primary purpose of an alternator?
• Store energy
• Charge the battery and power electrical systems
• / 4