Exam Questions And Correct Answers

Ohio Electric Vehicle Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the main function of an inverter in an electric vehicle?
• To convert AC to DC
• To convert DC to AC
• To step down voltage for accessories
• To regulate current flow

Rationale: The inverter converts DC from the battery to AC to power the

motor.

• Which of the following represents a high-voltage system in EVs?
• 12 V auxiliary battery
• 24 V starter motor
• 400 V traction battery 1 / 4

• 5 V sensor circuit

Rationale: Traction batteries operate at hundreds of volts to supply power

to the propulsion system.

• What color typically identifies high-voltage cables in EVs?
• Blue
• Green
• Orange
• Yellow

Rationale: Industry standards use orange insulation for high-voltage cables

to signal danger.

• Which safety equipment is mandatory when servicing high-voltage

systems?

• Cotton gloves
• Latex gloves
• Class 0 insulated gloves rated for 1000 V
• Leather gloves

Rationale: Class 0 gloves protect against voltages up to 1000 V, per OSHA

standards.

• / 4

• The DC-DC converter in an EV performs what function?
• Converts DC to AC
• Steps down high-voltage DC to 12 V DC
• Converts AC to DC
• Charges the traction battery

Rationale: It supplies low-voltage power for vehicle accessories and control

systems.

• When disconnecting a high-voltage battery, what should be done first?
• Pull service disconnect plug
• Remove negative terminal
• Disable the system following manufacturer shutdown procedure
• Open battery casing

Rationale: Each manufacturer defines an isolation and verification

procedure for safety.

• The main propulsion motor in an EV is typically what type?
• Brushed DC motor
• Synchronous reluctance motor
• AC induction or permanent magnet motor
• Stepper motor

Rationale: Modern EVs use high-efficiency AC induction or PM motors for

torque and reliability. 3 / 4

• Regenerative braking recovers what type of energy?
• Heat
• Kinetic
• Chemical
• Light

Rationale: Kinetic energy from motion is converted to electrical energy

during deceleration.

• A technician measuring isolation resistance between high-voltage and

chassis finds low resistance. What does this indicate?

• Normal condition
• High efficiency
• Potential insulation fault
• Weak cell voltage

Rationale: Low insulation resistance indicates leakage current or

compromised insulation.

• Which charger converts AC from the grid into DC stored in the battery?
• DC fast charger
• On-board DC-DC converter
• On-board charger
• / 4