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Charging practice questions

18 questions from the hybrid and electric vehicles practice test.

Charging practice test

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

What this covers

Sample questions

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
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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

The wall or pedestal unit used for Level 2 charging is correctly called EVSE. What is its job?

  1. Safely switch and supply AC to the vehicle
  2. Convert AC to DC before the cable
  3. Store grid energy for use at peak-rate times
  4. Balance the cells while charging
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A. Safely switch and supply AC to the vehicle

Electric vehicle supply equipment is a smart safety switch: it checks the connection, tells the car how much current is available and then closes its relay. The actual charger is in the vehicle.

Reference: SAE J1772; EVSE operation

The SAE J1772 connector is used for:

  1. DC fast charging only
  2. 12 V battery maintenance
  3. Three-phase AC charging only
  4. AC Level 1 and Level 2 charging
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D. AC Level 1 and Level 2 charging

The five-pin J1772 plug carries single-phase AC plus ground, pilot and proximity signals. DC fast charging needs added DC pins or a different connector.

Reference: SAE J1772

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