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EVSE Fundamentals & Charging Technologies
Q1: What is the standard voltage and plug configuration typically utilized for a Level 1
Electric Vehicle Supply Equipment (EVSE) setup?
A. 240V single-phase using a NEMA 14-50 plug
B. 120V single-phase using a standard 5-15 household outlet [CORRECT]
C. 480V three-phase using a hardwired connection
D. 208V three-phase using a NEMA L6-30 plug
Correct Answer: B
Rationale: The best answer is Level 1 charging because it is designed to simply plug
into a standard household 120-volt duplex receptacle, making it the most basic and
accessible form of EV charging without needing special electrical infrastructure.
Q2: When looking at the connector interface of a standard Level 2 charging station,
which communication protocol is used to negotiate the power delivery between the car
and the charger before current flows?
A. CAN bus high-speed communication
B. Power Line Communication (PLC) over the AC pins
C. Control Pilot circuit using a 1 kHz PWM signal [CORRECT]
D. Bluetooth Low Energy (BLE) wireless handshake
Correct Answer: C
Rationale: This choice is correct because the SAE J1772 standard defines the Control
Pilot pin as the method for the EVSE and the vehicle to communicate charging limits
and status using a specific pulse-width modulation signal before the AC power pins are
energized.
Q3: A fleet manager is looking to install chargers that can replenish a battery from 10%
to 80% in about 20 to 30 minutes for their delivery vans. Which charging level and
connector combination is most appropriate for this requirement?
A. Level 1 with a standard SAE J1772 connector
,B. Level 2 with a NACS (North American Charging Standard) connector
C. DC Fast Charging with a CCS (Combined Charging System) connector [CORRECT]
D. Level 2 with a CHAdeMO connector
Correct Answer: C
Rationale: The best answer is DC Fast Charging with CCS because DCFC bypasses
the vehicle's onboard charger to deliver high-voltage direct current directly to the
battery, which is the only charging level capable of that rapid 20 to 30-minute
turnaround time.
Q4: A customer asks if they can use an adapter to plug their Tesla (which has a NACS
port) into an older public charging station that only has a CHAdeMO connector for DC
fast charging. What is the most accurate response regarding adapter availability and
safety?
A. Adapters are widely available and safe to use for high-voltage DC fast charging
between these two standards.
B. Adapters do not exist for DC fast charging between NACS and CHAdeMO due to
complex digital communication differences and safety risks. [CORRECT]
C. You can easily build an adapter using off-the-shelf parts as long as you match the pin
diameters.
D. Adapters exist, but they will only allow Level 1 charging speeds.
Correct Answer: B
Rationale: This aligns with EVITP training which emphasizes that unlike simple AC level
1 or 2 passive adapters, DC fast charging requires active digital communication and
high-power handling, meaning safe adapters between completely different DC
standards like NACS and CHAdeMO are not practically available on the market.
Q5: What is the primary difference between the NACS connector and the SAE J1772
connector when used for Level 2 charging?
A. NACS uses a completely different voltage than J1772.
B. NACS is a smaller, more compact plug that integrates the AC pins and control pilot
into the same handle design used by Tesla. [CORRECT]
C. J1772 delivers DC power, while NACS delivers AC power.
D. NACS does not require a ground wire, whereas J1772 does.
Correct Answer: B
Rationale: The best answer is that NACS is essentially a more compact, streamlined
physical design for the same underlying AC charging process, integrating the same
required safety and communication pins into a smaller form factor compared to the
bulkier J1772 plug.
, Q6: During a site assessment for a multi-family dwelling, an installer notes that the
parking area only has access to 120V lighting circuits. If the property owner wants to
provide EV charging, what is the realistic expectation the installer should set?
A. Level 2 chargers can be installed by stepping up the voltage at the parking space.
B. Only Level 1 charging is feasible without a major service and infrastructure upgrade.
[CORRECT]
C. DC fast charging is actually easier to install on 120V circuits than Level 2.
D. The property cannot have any EV charging installed under NEC code.
Correct Answer: B
Rationale: This choice is correct because you physically cannot pull 240V needed for
Level 2 or high-voltage DC needed for DCFC from a 120V lighting circuit; the installer
must be honest that Level 1 is the only option without trenching new higher-voltage
feeders.
Q7: Why is the "proximity pilot" pin (often the shorter pin on a J1772 connector) a critical
safety feature in EVSE design?
A. It tells the charger how much power the car can accept.
B. It detects when the connector is firmly latched into the vehicle port and can
immediately stop current flow if the cable is unexpectedly removed. [CORRECT]
C. It provides the 240V power to the vehicle's inverter.
D. It connects the vehicle's chassis to the ground rod at the panel.
Correct Answer: B
Rationale: The best answer is that the proximity pilot is essentially a mechanical switch
that detects the physical latch status, ensuring that if someone drives off with the cable
plugged in or yanks it out, the power is cut instantly to prevent electrocution or arcing.
Q8: A customer asks why their brand-new EV charges twice as fast at a public 50 kW
DC fast charger compared to a 50 kW DC fast charger installed at their workplace.
What is the most likely explanation?
A. The vehicle's battery state of charge and thermal management system restrict
charging speed when the battery is already mostly full or too hot/cold. [CORRECT]
B. The workplace charger is secretly only wired for Level 2.
C. Public chargers use special "boost" algorithms not available to private businesses.
D. The vehicle automatically switches to AC charging at workplace chargers.
Correct Answer: A
Rationale: This choice is correct because EV batteries do not charge at a linear rate;
they accept the maximum kW only when at a low state of charge, and the battery
management system will aggressively throttle power to protect the cells if they are too
hot, too cold, or nearly full.