Here are 20 MCQs based on Unit III: Electronics and Sensor-less Control in EV, focusing on Understand and Apply levels of Bloom’s taxonomy:
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⚡ ELECTRONICS AND SENSOR-LESS CONTROL IN EV – MCQs
Section A: Basic Electronics Devices & Power Converters (Understand & Apply)
1. Which of the following devices allows current to flow in only one direction?
A) BJT
B) Thyristor
C) Diode
D) IGBT
Answer: C) Diode
2. A MOSFET is best suited for switching applications due to its:
A) High voltage drop
B) High input impedance
C) Slow response
D) Thermal instability
Answer: B) High input impedance
3. Which semiconductor device combines the characteristics of both MOSFET and BJT?
A) Diode
B) IGBT
C) SCR
D) Zener Diode
Answer: B) IGBT
4. Which power converter is typically used to convert DC to AC in an EV drive system?
A) Rectifier
B) Chopper
C) Inverter
D) Converter
Answer: C) Inverter
5. What is the main role of a thyristor in an EV control circuit?
A) Amplify signals
B) Allow AC to pass
C) Control high voltage power
D) Store energy
Answer: C) Control high voltage power
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Section B: EV Safety and Hazard Management (Understand & Apply)
6. Which one is a potential hazard while working on high-voltage EV systems?
A) Oil leakage
B) Electrical shock
C) Overheating tires
D) Radiator failure
Answer: B) Electrical shock
7. Which component is essential for safe disconnection of an EV high voltage system during maintenance?
A) Contact breaker
B) Safety switch
C) Precharge relay
D) Manual Service Disconnect (MSD)
Answer: D) Manual Service Disconnect (MSD)
8. What is a key safety precaution before servicing an electric vehicle?
A) Check coolant level
B) Disconnect 12V battery only
C) Deactivate the high-voltage system
D) Remove tires
Answer: C) Deactivate the high-voltage system
9. What should be used to safely handle EV components under high voltage?
A) Bare hands
B) Rubber gloves
C) Metallic tools
D) Wooden sticks
Answer: B) Rubber gloves
10. Which safety protocol is used to prevent EV battery fire hazards?
A) Oil cooling
B) Fusing the motor
C) Battery Management System (BMS)
D) Shielded metal casing
Answer: C) Battery Management System (BMS)
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Section C: Sensors and Autonomous Control (Understand & Apply)
11. Lidar and Radar sensors in EVs are mainly used for:
A) Power conversion
B) Motor control
C) Environment sensing
D) Battery charging
Answer: C) Environment sensing
12. Which of the following is NOT a potential risk to autonomous EV sensor systems?
A) Weather interference
B) Data hacking
C) Low tire pressure
D) Sensor misalignment
Answer: C) Low tire pressure
13. What is the function of a sensor in a self-driving car?
A) Generate power
B) Convert torque
C) Monitor surroundings
D) Store data
Answer: C) Monitor surroundings
14. Which of the following sensors can be targeted by hackers to disrupt EV navigation?
A) Motor sensor
B) Lidar
C) Fuel gauge
D) Speaker
Answer: B) Lidar
15. Which method improves safety by allowing an EV to operate without position sensors?
A) Hall effect sensor
B) Encoder-based detection
C) Sensor-less control method
D) Ultrasonic detection
Answer: C) Sensor-less control method
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Section D: Sensor-less Control Methods (Understand & Apply)
16. In phase flux linkage-based control, rotor position is estimated from:
A) Mechanical feedback
B) Phase voltage and current
C) Battery voltage
D) Lidar signal
Answer: B) Phase voltage and current
17. Which method is suitable for detecting rotor position at low speeds in sensorless control?
A) Hall sensors
B) PWM switching
C) Signal injection method
D) PID tuning
Answer: C) Signal injection method
18. Phase inductance-based control in EVs is primarily influenced by:
A) Frequency of switching
B) Rotor position
C) Inverter power loss
D) Sensor alignment
Answer: B) Rotor position
19. Observer-based control methods use:
A) Magnetic encoders
B) External sensors
C) Mathematical models of the motor
D) Camera-based detection
Answer: C) Mathematical models of the motor
20. Which of the following sensorless techniques works by injecting a high-frequency voltage?
A) Phase flux linkage
B) Observer-based method
C) Modulated signal injection
D) Mutually induced voltage-based
Answer: C) Modulated signal injection
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