Practice Test Geeks(CAE) Certified Automotive Engineer Practice Test
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EV Technology & Future Trends Flashcards

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

Read the first 7 EV Technology & Future Trends flashcards as text

  1. Which charging standard uses a Combined Charging System (CCS) connector and supports both AC and DC charging in North America?

    Answer: CCS1 (SAE J1772 combo)

    CCS1 combines the SAE J1772 AC inlet with two additional DC pins, allowing both Level 2 AC and DC fast charging through one connector.

  2. What is the primary function of the Battery Management System (BMS) in an EV?

    Answer: Monitor and balance individual cell voltages and temperatures

    The BMS monitors state of charge, state of health, and cell temperatures while actively balancing cells to maximize pack life and safety.

  3. Silicon carbide (SiC) MOSFETs are preferred over silicon IGBTs in EV inverters primarily because they:

    Answer: Allow higher switching frequencies with lower losses at high voltages

    SiC wide-bandgap devices switch faster with lower on-resistance at voltages above 400V, reducing inverter losses and enabling smaller, lighter power electronics.

  4. In a 800V EV architecture compared to 400V, which of the following is a direct advantage?

    Answer: Reduced copper cable cross-section for the same power transfer

    Doubling voltage halves current for equivalent power (P=VI), allowing significantly smaller wire gauges and reducing resistive losses in high-current paths.

  5. Vehicle-to-Grid (V2G) technology requires the EV's on-board system to include:

    Answer: A bidirectional DC/AC inverter capable of grid synchronization

    V2G demands power flow back to the grid, requiring an inverter that synchronizes AC output phase and frequency with the utility grid while operating bidirectionally.

  6. Lithium iron phosphate (LFP) cathode chemistry is increasingly used in base-trim EVs primarily because it offers:

    Answer: Longer cycle life and improved thermal stability at lower cost

    LFP's olivine crystal structure is highly stable thermally, supporting thousands of charge cycles, and avoids expensive cobalt/nickel, reducing cell cost.

  7. What does the term 'state of health' (SOH) represent in EV battery management?

    Answer: Ratio of present usable capacity to original rated capacity

    SOH quantifies capacity fade over time; a battery at 80% SOH retains only 80% of its original usable energy storage compared to when new.