ASE MEDIUM-HEAVY TRUCK T6
ELECTRICAL & ELECTRONIC SYSTEMS
PRACTICE EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary function of a battery in a vehicle electrical system?
A. Regulate voltage
B. Store and supply electrical energy
C. Increase alternator output
D. Reduce circuit resistance
Rationale: The battery stores electrical energy and supplies power for
starting and when demand exceeds alternator output.
2. What unit is used to measure electrical current?
A. Volts
B. Amperes
C. Ohms
D. Watts
Rationale: Amperes measure the rate of electron flow in a circuit.
3. Which component converts mechanical energy into electrical energy?
A. Battery
B. Starter
C. Alternator
D. Solenoid
Rationale: The alternator generates electrical energy from engine
rotation.
,4. What happens to current when resistance increases in a fixed-voltage
circuit?
A. It increases
B. It decreases
C. It stays the same
D. It becomes AC
Rationale: According to Ohm’s Law, current decreases as resistance
increases.
5. Which type of current does a battery supply?
A. Alternating current
B. Direct current
C. Pulsed current
D. Inductive current
Rationale: Batteries supply direct current (DC).
6. What is the function of a fuse?
A. Increase voltage
B. Store electricity
C. Protect circuits from excessive current
D. Regulate alternator output
Rationale: Fuses open the circuit when current exceeds safe limits.
7. What tool is best for checking circuit voltage?
A. Ohmmeter
B. Voltmeter
C. Ammeter
D. Test light only
Rationale: A voltmeter measures electrical potential difference.
8. Which condition causes a battery to sulfate?
A. Overcharging
B. Undercharging
C. High temperature
D. New battery installation
Rationale: Chronic undercharging leads to sulfate buildup on plates.
, 9. What is the purpose of a ground circuit?
A. Increase resistance
B. Complete the electrical circuit
C. Store electrons
D. Reduce voltage
Rationale: The ground provides the return path to complete the circuit.
10.Which component engages the starter drive with the flywheel?
A. Starter motor
B. Starter solenoid
C. Battery
D. Ignition switch
Rationale: The solenoid moves the drive gear into mesh.
11.What type of wiring diagram shows components in their relative positions?
A. Schematic
B. Pictorial
C. Block
D. Ladder
Rationale: Pictorial diagrams show physical appearance and location.
12.What happens if a circuit has an open?
A. Excessive current flows
B. No current flows
C. Voltage doubles
D. Resistance becomes zero
Rationale: An open circuit breaks continuity, stopping current flow.
13.Which device stores electrical energy chemically?
A. Battery
B. Capacitor
C. Alternator
D. Relay
Rationale: Batteries store energy through chemical reactions.
ELECTRICAL & ELECTRONIC SYSTEMS
PRACTICE EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary function of a battery in a vehicle electrical system?
A. Regulate voltage
B. Store and supply electrical energy
C. Increase alternator output
D. Reduce circuit resistance
Rationale: The battery stores electrical energy and supplies power for
starting and when demand exceeds alternator output.
2. What unit is used to measure electrical current?
A. Volts
B. Amperes
C. Ohms
D. Watts
Rationale: Amperes measure the rate of electron flow in a circuit.
3. Which component converts mechanical energy into electrical energy?
A. Battery
B. Starter
C. Alternator
D. Solenoid
Rationale: The alternator generates electrical energy from engine
rotation.
,4. What happens to current when resistance increases in a fixed-voltage
circuit?
A. It increases
B. It decreases
C. It stays the same
D. It becomes AC
Rationale: According to Ohm’s Law, current decreases as resistance
increases.
5. Which type of current does a battery supply?
A. Alternating current
B. Direct current
C. Pulsed current
D. Inductive current
Rationale: Batteries supply direct current (DC).
6. What is the function of a fuse?
A. Increase voltage
B. Store electricity
C. Protect circuits from excessive current
D. Regulate alternator output
Rationale: Fuses open the circuit when current exceeds safe limits.
7. What tool is best for checking circuit voltage?
A. Ohmmeter
B. Voltmeter
C. Ammeter
D. Test light only
Rationale: A voltmeter measures electrical potential difference.
8. Which condition causes a battery to sulfate?
A. Overcharging
B. Undercharging
C. High temperature
D. New battery installation
Rationale: Chronic undercharging leads to sulfate buildup on plates.
, 9. What is the purpose of a ground circuit?
A. Increase resistance
B. Complete the electrical circuit
C. Store electrons
D. Reduce voltage
Rationale: The ground provides the return path to complete the circuit.
10.Which component engages the starter drive with the flywheel?
A. Starter motor
B. Starter solenoid
C. Battery
D. Ignition switch
Rationale: The solenoid moves the drive gear into mesh.
11.What type of wiring diagram shows components in their relative positions?
A. Schematic
B. Pictorial
C. Block
D. Ladder
Rationale: Pictorial diagrams show physical appearance and location.
12.What happens if a circuit has an open?
A. Excessive current flows
B. No current flows
C. Voltage doubles
D. Resistance becomes zero
Rationale: An open circuit breaks continuity, stopping current flow.
13.Which device stores electrical energy chemically?
A. Battery
B. Capacitor
C. Alternator
D. Relay
Rationale: Batteries store energy through chemical reactions.
