CAE EV Technology & Future Trends 1 — Questions and Answers
Question 1: What is the primary difference between a BEV and a PHEV?
- BEVs run entirely on battery power; PHEVs have both a battery and an internal combustion engine (Correct answer)
- BEVs are faster than PHEVs
- PHEVs have larger batteries than BEVs
- BEVs use hydrogen fuel cells
Correct answer: BEVs run entirely on battery power; PHEVs have both a battery and an internal combustion engine
Battery Electric Vehicles (BEVs) use only electric motors and batteries. Plug-in Hybrid Electric Vehicles (PHEVs) combine a smaller battery with a gasoline engine, offering both electric-only and hybrid driving modes.
Question 2: What does kWh measure in electric vehicle batteries?
- Kilowatt-hours, the total energy storage capacity of the battery (Correct answer)
- The maximum speed of the vehicle
- The charging voltage required
- The battery's physical weight
Correct answer: Kilowatt-hours, the total energy storage capacity of the battery
kWh measures the total energy a battery can store. A higher kWh rating generally means greater driving range. For example, a 100 kWh battery stores enough energy to run a 100 kW motor for one hour.
Question 3: What is DC fast charging and how does it differ from Level 2 charging?
- DC fast charging bypasses the vehicle's onboard charger to deliver high-power direct current, charging much faster than Level 2 AC charging (Correct answer)
- DC is slower but safer than Level 2
- They charge at the same speed but use different plugs
- DC fast charging only works at home
Correct answer: DC fast charging bypasses the vehicle's onboard charger to deliver high-power direct current, charging much faster than Level 2 AC charging
DC fast charging delivers 50-350+ kW directly to the battery, enabling 10-80% charge in 15-45 minutes. Level 2 AC charging (6-19 kW) uses the vehicle's onboard charger and takes 4-12 hours.
Question 4: What is thermal management in EV battery systems?
- Systems that maintain optimal battery temperature for performance, longevity, and safety through heating and cooling (Correct answer)
- Managing the temperature inside the vehicle cabin only
- The color of the battery pack
- The noise level of the cooling fans
Correct answer: Systems that maintain optimal battery temperature for performance, longevity, and safety through heating and cooling
Battery thermal management uses liquid cooling, heating elements, and heat pumps to keep battery cells within their optimal temperature range (typically 20-40°C), which is critical for performance, charging speed, and lifespan.
Question 5: What is vehicle-to-grid (V2G) technology?
- Technology enabling EVs to send stored electricity back to the power grid during peak demand (Correct answer)
- A GPS navigation system for electric vehicles
- A vehicle tracking system for fleet management
- A wireless charging technology
Correct answer: Technology enabling EVs to send stored electricity back to the power grid during peak demand
V2G allows electric vehicles to function as mobile energy storage, supplying power back to the grid during high demand periods, potentially earning money for EV owners and stabilizing the electrical grid.
Question 6: What is the SAE Level classification system for autonomous driving?
- A 0-5 scale defining the degree of driving automation, from no automation (Level 0) to full automation (Level 5) (Correct answer)
- A safety rating system for vehicle crash performance
- A classification of engine displacement sizes
- A fuel efficiency rating system
Correct answer: A 0-5 scale defining the degree of driving automation, from no automation (Level 0) to full automation (Level 5)
SAE International defines six levels: Level 0 (no automation), Level 1 (driver assistance), Level 2 (partial automation), Level 3 (conditional automation), Level 4 (high automation), and Level 5 (full automation).
CAE EV Technology & Future Trends 1
What is the primary difference between a BEV and a PHEV?