Practice Test Geeks(EVT) Certified Electric Vehicle Technician Practice Test
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Electric Vehicle Systems & Powertrains Flashcards

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

Read the first 7 Electric Vehicle Systems & Powertrains flashcards as text

  1. What is the primary function of a DC-DC converter in an electric vehicle?

    Answer: Convert high-voltage traction battery power to 12V for auxiliary systems

    The DC-DC converter steps down high-voltage traction pack voltage (typically 300–800V) to ~12–14V to power the vehicle's conventional 12V auxiliary systems.

  2. In a permanent magnet synchronous motor (PMSM), rotor speed is synchronized with:

    Answer: The rotating magnetic field frequency produced by the inverter

    A PMSM rotor's permanent magnets lock onto the stator's rotating magnetic field, so rotor speed matches the inverter output frequency.

  3. Which component in an EV powertrain is responsible for converting DC battery power into the three-phase AC required by the traction motor?

    Answer: Inverter (power electronics controller)

    The inverter uses IGBTs or MOSFETs to switch DC power and synthesize three-phase AC at the frequency and voltage needed to control the traction motor.

  4. During regenerative braking, the electric motor operates as a:

    Answer: Generator converting kinetic energy into electrical energy

    When braking, the motor's rotor is driven by wheel momentum, generating AC electricity that the inverter converts to DC and returns to the traction battery.

  5. A single-speed reduction gear is commonly used in EV powertrains because electric motors:

    Answer: Deliver high torque across a wide RPM range, eliminating the need for multi-speed gearboxes

    Electric motors produce near-peak torque from zero RPM and maintain usable torque across a broad speed range, making multi-speed transmissions largely unnecessary.

  6. What does 'motoring mode' mean in the context of an EV traction motor?

    Answer: The motor is converting electrical energy into mechanical energy to propel the vehicle

    In motoring mode, electrical energy from the battery is converted by the motor into rotational mechanical energy to drive the wheels.

  7. Which type of EV powertrain layout places a motor at each driven axle, eliminating a traditional driveshaft?

    Answer: Dual-motor all-wheel drive layout

    A dual-motor AWD layout uses one motor per axle, enabling independent torque control at front and rear without a mechanical driveshaft.