Here are 5 two-mark questions from Unit III – Electronics and Sensor-less Control in EV, designed using Apply, Analyze, Evaluate, and Create levels of Bloom's Taxonomy, along with model answers:
✅ 1. Apply Level
Q: Apply your understanding of power semiconductor devices to recommend whether an IGBT or a MOSFET is more suitable for high-voltage inverter applications in EVs. Justify your answer.
Answer:
IGBT is more suitable for high-voltage applications because it can handle higher voltage and current with lower conduction losses compared to MOSFETs, making it ideal for inverter circuits in EVs.
✅ 2. Analyze Level
Q: Analyze the safety challenges involved in handling high-voltage components in electric vehicles.
Answer:
High-voltage EV systems can cause severe electric shock, fire hazards, and component damage. Proper insulation, automatic disconnection systems, and protective equipment are essential to ensure user and technician safety.
✅ 3. Evaluate Level
Q: Evaluate the effectiveness of sensor-less control techniques in autonomous electric vehicles compared to traditional sensor-based methods.
Answer:
Sensor-less control reduces system cost and improves reliability by eliminating physical sensors. However, it may have limitations under low-speed conditions or rapid dynamic changes where sensor feedback could be more accurate.
✅ 4. Analyze Level
Q: Analyze how the phase inductance-based method contributes to rotor position estimation in sensor-less motor control.
Answer:
In the phase inductance-based method, the inductance varies with rotor position. By measuring this variation, the system can estimate rotor location without physical sensors, enabling sensor-less motor operation.
✅ 5. Create Level
Q: Create a simple model to demonstrate how observer-based control can be implemented for estimating speed in a BLDC motor.
Answer:
An observer-based model uses real-time voltage and current inputs along with motor parameters to estimate rotor speed and position. Kalman Filter or Luenberger Observer can be implemented in the controller software to simulate this.
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