1. The main purpose of regenerative braking in EVs is to:
(A) Increase motor torque
(B) Recover kinetic energy and convert it into electrical energy
(C) Reduce battery voltage
(D) Maintain constant speed
2. In regenerative braking, the electric motor acts as a:
(A) Load
(B) Generator
(C) Inverter
(D) Battery
3. The electrical energy generated during regenerative braking is:
(A) Lost as heat
(B) Stored back in the battery
(C) Used to power the headlights
(D) Sent to the exhaust
4. Regenerative braking improves:
(A) Vehicle speed
(B) Energy efficiency and driving range
(C) Tire grip
(D) Transmission losses
5. The effectiveness of regenerative braking depends on:
(A) Battery SOC and motor speed
(B) Vehicle color
(C) Tire pressure
(D) Brake pad condition
6. When the battery is fully charged, regenerative braking is:
(A) More efficient
(B) Disabled or limited to prevent overcharging
(C) Operates normally
(D) Enhances motor torque
7. Regenerative braking can be applied effectively in:
(A) Both hybrid and electric vehicles
(B) Only in fuel-based vehicles
(C) Only in manual transmission vehicles
(D) Diesel engines only
8. The control system that manages regenerative braking is part of the:
(A) Vehicle Control Unit (VCU)
(B) Powertrain cooling system
(C) Lighting system
(D) Transmission control
9. During regenerative braking, current flows:
(A) From the motor to the battery
(B) From the battery to the motor
(C) From the inverter to the grid
(D) From the charger to the inverter
10. The motor torque during regenerative braking is:
(A) Positive
(B) Negative
(C) Zero
(D) Infinite
11. Regenerative braking torque is proportional to:
(A) Rotor speed and magnetic flux
(B) Battery voltage only
(C) Air drag
(D) Wheel radius
12. In induction motor-based EVs, regenerative braking is achieved by:
(A) Increasing rotor speed above synchronous speed
(B) Reducing current
(C) Using resistors
(D) Mechanical clutching
13. In BLDC or PMSM motors, regenerative braking is achieved by:
(A) Reversing motor current direction
(B) Increasing current
(C) Reducing DC bus voltage
(D) Disabling inverter
14. The type of braking that uses both regenerative and mechanical braking is called:
(A) Dynamic braking
(B) Blended braking
(C) Pure regenerative braking
(D) Torque braking
15. Dynamic braking differs from regenerative braking because:
(A) Energy is dissipated in resistors instead of stored in the battery
(B) It increases battery SOC
(C) It uses the same inverter circuit
(D) It’s more efficient
16. The regenerative braking efficiency in modern EVs typically ranges between:
(A) 10–20%
(B) 20–40%
(C) 50–70%
(D) 80–100%
17. Regenerative braking is most effective:
(A) At high speeds
(B) At standstill
(C) During acceleration
(D) On slippery roads
18. The inverter in the regenerative braking circuit:
(A) Converts AC generated by the motor into DC for the battery
(B) Converts DC to AC
(C) Stores current directly
(D) Acts as a relay
19. In regenerative braking, the braking force is controlled by:
(A) Varying regenerative current
(B) Adjusting air pressure
(C) Using mechanical brakes only
(D) Reducing torque linearly
20. One limitation of regenerative braking is:
(A) It cannot bring the vehicle to a complete stop alone
(B) It causes excessive heating
(C) It requires more battery voltage
(D) It increases mechanical wear
21. The energy recovery in regenerative braking is dependent on:
(A) Vehicle mass and speed
(B) Engine oil quality
(C) Tire diameter only
(D) Paint color
22. The control algorithm used for smooth transition between regenerative and friction braking is called:
(A) Brake Blending Control
(B) Torque Modulation
(C) Field-Oriented Control
(D) Direct Torque Control
23. The maximum regenerative braking torque is limited by:
(A) Battery charging current limit
(B) Vehicle mass
(C) Tire wear
(D) Brake fluid pressure
24. The braking energy recovery system helps to:
(A) Reduce overall energy consumption
(B) Increase tire friction
(C) Reduce battery voltage
(D) Increase motor temperature
25. In hybrid electric vehicles, regenerative braking:
(A) Recharges the traction battery
(B) Controls the alternator
(C) Operates the ICE directly
(D) Bypasses the motor
26. The regenerative braking system reduces wear on:
(A) Brake pads and rotors
(B) Tires
(C) Transmission belts
(D) Suspension system
27. The braking torque generated during regenerative braking is opposite to:
(A) Vehicle motion
(B) Battery voltage
(C) Motor flux
(D) Current flow
28. The controller that coordinates regenerative and friction braking in EVs is called:
(A) Brake Control Unit (BCU)
(B) Motor Drive Unit
(C) Power Distribution Unit
(D) Battery Module Controller
29. In EVs, regenerative braking can contribute up to approximately what percentage of total energy savings?
(A) 5–10%
(B) 10–15%
(C) 15–30%
(D) 50%
30. The primary control goal of regenerative braking in EVs is to:
(A) Maximize energy recovery while maintaining braking stability and safety
(B) Increase motor losses
(C) Decrease battery capacity
(D) Stop the motor immediately