KIET_EV KIET University - EV Technology The number of attempts remaining is 1 1 / 12 1. Which method estimates battery State of Charge (SOC) by integrating battery current over time? a. Grade estimation b. Coulomb counting c. Aerodynamic mapping d. Wheel-speed counting 2 / 12 2. When cells are connected in series in an EV battery pack, what primarily increases? a. Tyre pressure b. Motor speed c. Wheel diameter d. Voltage 3 / 12 3. A PMSM rotor rotates at: a. Zero speed b. A speed lower than the rotating magnetic field c. Synchronous speed d. A speed much higher than the rotating magnetic field 4 / 12 4. Which motor uses electronic commutation instead of mechanical commutation? a. DC motor b. BLDC motor c. Shunt motor d. Series motor 5 / 12 5. Back EMF in an EV motor is directly proportional to motor: a. Current b. Speed c. Torque d. Rotor resistance 6 / 12 6. During regenerative braking, the traction motor operates as a: a. Capacitor b. Generator c. Transformer d. Rectifier 7 / 12 7. Which component converts battery DC into AC for a typical three-phase EV traction motor? a. Inverter b. Radiator c. Differential d. On-board charger 8 / 12 8. Which component is mainly used to detect rotor position in a BLDC motor? a. Battery charger b. Radiator c. Hall sensor d. Differential 9 / 12 9. The negative sign in Faraday's law represents: a. Rotor resistance b. Power loss c. Energy storage d. Lenz's law opposition 10 / 12 10. Why are single-speed gearboxes commonly used in many electric vehicles? a. Batteries require multiple gears b. Electric motors have a wide useful speed range c. EV motors cannot produce torque d. Regenerative braking needs a clutch 11 / 12 11. What is the main purpose of a Battery Management System (BMS) in an electric vehicle? a. Control steering mechanically b. Replace the traction motor c. Monitor battery cell voltage and current d. Increase tyre pressure 12 / 12 12. Which type of electric vehicle uses a battery as its sole propulsion energy source? a. PHEV b. HEV c. BEV d. FCEV Your score is
