Power Electronics Midterm with correct answers 100% 2026

Power Electronics Midterm with correct answers 100% 2026 The power derating of transistors is affected by temperatures of: - Correct Answer The junction, the case, and the sink What is power electronics? - Correct Answer control and conversion of electrical power by semiconductor devices Rectifier - Correct Answer turns AC voltage into DC voltage Inverter - Correct Answer Converts a DC voltage into an AC voltage Chopper/switch-mode - Correct Answer DC to DC Cycloconverter / CycloInverter - Correct Answer conversion of AC to another AC. Capacitors behave like: - Correct Answer Voltage sources Inductors behave like: - Correct Answer Current sources The larger the capacitance and inductance the more resemblance to a - Correct Answer source In steady state, the average capacitor current must be - Correct Answer zero In steady state, the average inductor current is - Correct Answer zero A diode conducts when - Correct Answer it's anode voltage cathode voltage 4 types of diode models - Correct Answer Analog Model Piecewise Linear Model Constant Voltage Drop Model Ideal Model Piecewise Linear Model includes: - Correct Answer internal voltage and resistance Constant Voltage Drop Model includes - Correct Answer internal voltage Ideal Model includes - Correct Answer no voltage drop or internal resistance Which diode model should be used under what context? - Correct Answer Determine the accuracy requirement and pick the simplest one that meets the requirement (10% inaccuracy) Forward biased diodes are - Correct Answer Short circuits Reversed biased diodes are - Correct Answer Open circuits Reverse recovery time - Correct Answer The total time required for a diode to change mode from forward to reverse bias Reverse recovery time is measured from - Correct Answer the initial zero crossing to 25% of the maximum reverse current Two types of recovery characteristics - Correct Answer Soft and abrupt Schottky diodes are used for - Correct Answer low voltage, high current applications, higher frequency designs Zener diodes are designed so that they operate in - Correct Answer reverse bias Large resistances in parallel with diodes are used for - Correct Answer reducing losses by sharing the reverse voltage, can perform under heavy forward voltage Small resistances in series with diodes help to - Correct Answer share the currents and can withstand heavier forward currents, but generates more losses Snubber circuits help to - Correct Answer reduce the rate of change between anode and cathode, shares transient and steady state voltage In the absence of a diode, a LC circuit will - Correct Answer oscillate forever A freewheeling diode is used as a - Correct Answer Safety precaution for switched RL loads