Punjab PSEB Matric NSQF Automotive (EV Service Assistant) flashcards

34 cards. Read the term and the definition here. The deck at the top of this page is optional.

BEV

Battery Electric Vehicle: runs only on a rechargeable battery pack feeding an electric motor; has no petrol or diesel engine and no fuel tank, so it is charged from an external supply.

PHEV

Plug-in Hybrid Electric Vehicle: combines an internal combustion engine with a battery that can be charged from the grid; it can run short distances on electric power alone.

NSQF Level 4

National Skills Qualification Framework level describing supervised skilled work; the PSEB Matric NSQF automotive qualification is mapped here, covering routine EV service tasks under a supervisor.

Ohm's Law

States that current through a conductor equals voltage divided by resistance (I = V/R). Used to calculate expected current, find faulty high-resistance joints, and select correct fuse ratings.

Series vs parallel

Series connection sums voltages while current capacity stays the same; parallel connection sums capacity while voltage stays the same. Cell arrangement in a pack sets pack voltage and Ah rating.

Multimeter continuity mode

Function that beeps when resistance is near zero, confirming an unbroken conductor. Used only on de-energised circuits to trace open wiring, blown fuses and broken switches.

CAN bus

Two-wire differential serial network (CAN-H and CAN-L) that lets the BMS, motor controller and display share data. Faults appear as communication errors or a bus-off state.

BMS

Battery Management System: electronic unit that monitors cell voltages and temperature, balances cells, estimates state of charge and health, and trips protection on over-charge, over-discharge or over-current.

State of Charge (SoC)

Percentage of usable charge remaining in the pack, analogous to a fuel gauge. Estimated from voltage, current integration and temperature, and reported to the dashboard over CAN.

State of Health (SoH)

Ratio of present usable capacity to the original rated capacity, expressed as a percentage. A falling SoH indicates ageing, and it guides warranty and replacement decisions.

Cell balancing

Process of equalising voltages across series cells so the weakest cell does not limit pack capacity. Passive balancing dissipates excess energy as heat; active balancing moves charge between cells.

LFP cell voltage

Lithium iron phosphate chemistry has a nominal cell voltage near 3.2 V and full charge near 3.65 V. It is thermally stable and long-cycling, so common in Indian electric three-wheelers.

BLDC motor

Brushless DC motor with permanent magnets on the rotor and electronic commutation of stator phases. It is efficient and low-maintenance, making it standard in Indian electric two- and three-wheelers.

Motor controller

Power electronics unit that converts battery DC into controlled three-phase output for the motor, regulating torque and speed while protecting against over-current, over-temperature and throttle faults.

Hall sensor

Device in a BLDC motor that reports rotor position to the controller. Failure causes jerking, wrong direction or no start; it is tested on the 5 V signal line with a multimeter.

Regenerative braking

Recovering kinetic energy by running the motor as a generator during deceleration and feeding charge back to the battery. It works only above a minimum speed.

AC vs DC charging

AC charging supplies mains power to the vehicle's on-board charger, which converts to DC; DC fast charging converts outside the vehicle and feeds the battery directly at higher power.

Bharat DC-001

Indian DC fast-charging standard for small EVs, operating at 48-72 V with output up to about 15 kW. It is widely deployed for electric cars and three-wheelers.

CCS2 connector

Combined Charging System Type 2 connector that adds two DC pins to the AC Type 2 layout. It supports high-power DC fast charging and is the standard for larger electric cars.

Charging mode 3

Charging method using a dedicated EV supply equipment unit with control pilot communication between charger and vehicle, providing protection and safe energisation before current flows.

Service plug

Removable high-voltage interlock device that breaks the battery pack into safe sections for maintenance. It must be removed and stored away from the work area before pack work begins.

No-start checklist

Sequence for a dead EV: check 12 V auxiliary battery, brake-cut switch, side-stand switch, throttle signal, fuses and BMS protection state before condemning the motor or controller.

Reduced range diagnosis

Check tyre pressure, brake drag, rider behaviour, ambient temperature, charger output and battery state of health. Ageing cells with low SoH are a common cause of gradual range loss.

HV threshold

Any DC system above 60 V or AC system above 30 V is treated as high voltage. Traction packs in this range require insulated tools, gloves and lockout before work.

Class 0 gloves

Insulating rubber gloves rated for 1000 V AC, worn with leather protectors for high-voltage work. They must be air-tested before use and retested every six months.

Lockout tagout

Procedure of isolating the energy source, locking the isolator, attaching a warning tag and verifying zero voltage so the circuit cannot be re-energised during maintenance.

Lithium battery fire

Battery fire that can reignite hours after apparent extinguishing. Respond with copious water or suitable extinguisher, isolate the vehicle, and monitor the pack for re-ignition.

Electrolyte splash first aid

Flush affected skin or eyes with clean water for at least 15 minutes, remove contaminated clothing, and obtain medical help. Do not induce vomiting if electrolyte is swallowed.

Torque wrench

Calibrated tool that clicks or signals when the set tightening torque is reached. It is used only for tightening to specification and must never be used to loosen fasteners.

Job card

Workshop record capturing customer details, vehicle number, VIN, odometer, reported complaint, diagnosis, parts replaced, labour and signatures. It supports warranty claims and repeat-repair tracking.

VIN

Vehicle Identification Number: a unique 17-character code stamped on the chassis that identifies manufacturer, model, year and serial. It is recorded on every job card and warranty claim.

Active listening

Communication skill of giving full attention, not interrupting, and restating the customer's complaint to confirm understanding before diagnosis or repair begins.

Udyam registration

Indian MSME registration obtained online using Aadhaar and PAN. It gives a small EV workshop access to government schemes, easier credit and tender eligibility.

Battery recycling

Recovery of lithium, cobalt, nickel and copper from end-of-life packs by authorised recyclers. Workshops must hand over used packs to registered recyclers, never informal scrap dealers.