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