Practice Test Geeks(EVITP) Electric Vehicle Infrastructure Program Practice Test
← All EVITP Flashcard Decks

Technology and Equipment Flashcards

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

Read the first 7 Technology and Equipment flashcards as text

  1. Which communication protocol is most commonly used by EVSE to communicate with the electric vehicle during a DC fast charge session?

    Answer: Combined Charging System (CCS) PLC

    CCS uses Power Line Communication (PLC) over the pilot line to enable the vehicle and EVSE to negotiate charging parameters during DC fast charging.

  2. What is the purpose of the contactor in a DC fast charging station?

    Answer: Isolate high-voltage DC from the output connector when not charging

    The contactor is a high-current switch that physically connects or disconnects the DC bus from the charging connector, ensuring safety when the connector is not engaged.

  3. In an EVSE network management system, what does OCPP stand for?

    Answer: Open Charge Point Protocol

    OCPP (Open Charge Point Protocol) is an open standard that allows EVSE hardware from different manufacturers to communicate with a common network management backend.

  4. A technician notices a Level 2 EVSE is delivering only 16 A instead of the rated 32 A. Which component, if faulty, would most likely cause this output reduction?

    Answer: A failed or thermally derated power relay in the EVSE

    A failed or overheated relay/contactor in the EVSE can cause it to thermally derate, limiting current output to protect the hardware.

  5. What is the typical pilot signal frequency used in SAE J1772 EVSE-to-vehicle communication?

    Answer: 1 kHz

    SAE J1772 specifies a 1 kHz pilot signal used on the control pilot line to communicate maximum available current and charger state to the vehicle.

  6. Which insulation resistance test value is considered the minimum acceptable when testing EVSE wiring before energizing a new installation?

    Answer: 1 MΩ

    A minimum insulation resistance of 1 MΩ (megohm) is generally required to confirm that wiring insulation is intact and safe to energize.

  7. What does the duty cycle of the SAE J1772 pilot signal indicate to the electric vehicle?

    Answer: The maximum current the EVSE can supply

    The duty cycle of the 1 kHz pilot signal encodes the maximum available current: for example, a 50% duty cycle indicates 24 A available.