CAE EV Technology & Future Trends 2

Question 1

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

Accepted Answer

CCS1 (SAE J1772 combo)

Answer

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

Question 2

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

Accepted Answer

Monitor and balance individual cell voltages and temperatures

Answer

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

Question 3

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

Accepted Answer

Allow higher switching frequencies with lower losses at high voltages

Answer

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

Question 4

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

Accepted Answer

Reduced copper cable cross-section for the same power transfer

Answer

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

Question 5

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

Accepted Answer

A bidirectional DC/AC inverter capable of grid synchronization

Answer

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.

(CAE) Certified Automotive Engineer Practice Test

(CAE) Certified Automotive Engineer Practice Test

CAE EV Technology & Future Trends 2