EVITP EV Technology Fundamentals 2 — Questions and Answers
Question 1: What is the difference between AC and DC charging?
- AC charging converts power inside the vehicle; DC charging converts power externally and delivers DC directly (Correct answer)
- No difference
- AC is always faster
- DC is only for homes
Correct answer: AC charging converts power inside the vehicle; DC charging converts power externally and delivers DC directly
The location of power conversion differs between the two methods.
Question 2: What is an onboard charger in an EV?
- The vehicles built-in AC-to-DC converter that charges the battery from AC sources (Correct answer)
- The charging cable
- The battery itself
- The dashboard display
Correct answer: The vehicles built-in AC-to-DC converter that charges the battery from AC sources
This converter inside the vehicle changes AC power to DC for the battery.
Question 3: What factors affect EV charging speed?
- Battery SOC, temperature, charger power rating, and vehicles maximum acceptance rate (Correct answer)
- Only the charger power
- Only the battery size
- Only the cable length
Correct answer: Battery SOC, temperature, charger power rating, and vehicles maximum acceptance rate
Multiple factors on both the vehicle and charger side determine actual speed.
Question 4: What is battery cell balancing?
- Equalizing charge levels among individual cells for optimal performance and safety (Correct answer)
- Physically rearranging cells
- Adding new cells
- Replacing damaged cells
Correct answer: Equalizing charge levels among individual cells for optimal performance and safety
Balancing ensures all cells in a pack operate at similar charge levels.
Question 5: What is the typical DC fast charging power range?
- 50 kW to 350+ kW (Correct answer)
- 1-5 kW
- 10-20 kW
- 500+ kW standard
Correct answer: 50 kW to 350+ kW
DC fast chargers deliver high power for rapid charging.
Question 6: What safety features are built into EV charging systems?
- Ground fault detection, over-temperature protection, communication protocols, and automatic shutoff (Correct answer)
- No safety features
- Only a fuse
- Only a power switch
Correct answer: Ground fault detection, over-temperature protection, communication protocols, and automatic shutoff
Multiple layers of safety protection are integrated into the system.
EVITP EV Technology Fundamentals 2
What is the difference between AC and DC charging?