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Hybrid & Electric Vehicle Technician Practice Test

High-voltage safety, battery systems, motors and inverters, charging, regenerative braking and diagnosis for hybrid and EV certification.

166 questions · 7 topics · free, no sign-up

Mixed practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

Timed mock exam

50 questions in 60 minutes, drawn from every topic. No answers shown until the end, then a score, your weakest topics and a review of what you missed.

Practise by topic

Sample questions

What sets a plug-in hybrid apart from a conventional full hybrid?

  1. A smaller engine with no starter motor
  2. A 48 V system in place of a high-voltage one
  3. A larger battery that charges from the grid
  4. A motor that cannot drive the wheels
Show the answer

C. A larger battery that charges from the grid

A plug-in carries a bigger pack and a charge port so it can cover meaningful distance on grid electricity. A normal hybrid recharges only from the engine and braking.

Reference: Vehicle electrification types

Connecting battery cells in series does what?

  1. Raises amp-hours; voltage stays the same
  2. Raises both voltage and amp-hours
  3. Lowers voltage and raises amp-hours
  4. Raises voltage; amp-hours stay the same
Show the answer

D. Raises voltage; amp-hours stay the same

Series cells add their voltages while the same current flows through each, so capacity in amp-hours is unchanged. Adding amp-hours takes parallel connection.

Reference: Series and parallel circuits

What happens to regenerative braking when the battery is fully charged?

  1. It is reduced and friction brakes do more
  2. It gets stronger to burn off energy
  3. It continues and charges the 12 V battery
  4. It is unchanged at any state of charge
Show the answer

A. It is reduced and friction brakes do more

A full battery has nowhere to put the energy, so the controller cuts regeneration and makes up the difference hydraulically. Drivers notice it on a long downhill after a full charge.

Reference: Regenerative braking limits

During DC fast charging, where is AC converted to DC?

  1. In the onboard charger
  2. In the traction inverter
  3. In the charging station
  4. In the DC-DC converter
Show the answer

C. In the charging station

The station holds the large rectifier and sends DC straight to the battery, bypassing the onboard charger. That is how it delivers far more power than the car's own charger could.

Reference: DC fast charging operation

A traction battery supplies 50 A at 300 V. How much power is that, in kilowatts?

Answer in kW.

Show the answer

15 kW

P = V x I = 300 V x 50 A = 15,000 W. Divide by 1,000: 15 kW.

Reference: Watt's law

Exams this helps with

ExamWho runs itWhere
Light duty hybrid / electric vehicle specialist (L3) readyASEUnited States
Electrical / electronic systems (A6) readyASEUnited States

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