Electrical Engg (EEE) - MCQ Practice Questions
Practice free Electrical Engg (EEE) multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.
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In a multilevel inverter topology, the total harmonic distortion (THD) compared to a two-level inverter is:
The thermal resistance (Rtheta-JA) of a power semiconductor determines:
In a current-source inverter (CSI), the DC link contains:
The switching frequency of a PWM inverter is 10 kHz. What is the fundamental frequency of the output if the modulation index is 0.8?
Which modulation technique provides the best harmonic performance in high-power applications?
What is the conduction angle of each thyristor in a three-phase full converter operating at 60° firing angle?
The turn-off time of an IGBT at 25°C is typically in the range of:
What is the typical efficiency range of modern power MOSFETs in switching applications?
The dv/dt rating of a thyristor is critical because:
In a resonant DC-DC converter, what is the primary advantage over PWM converters?
Which of the following is NOT a source of harmonic distortion in power converters?
In soft-switching topologies, Zero Current Switching (ZCS) means switching occurs when:
In a three-phase fully controlled bridge rectifier operating at 50 Hz with a firing angle of 60°, what is the average output voltage if the RMS line-to-line voltage is 415V?
In a boost converter with duty cycle D = 0.4, input voltage Vi = 48V, and output voltage Vo = 80V, what is the voltage stress across the switch?
Which of the following topologies is most suitable for soft-switching operation in modern DC-DC converters?
In an IGBT, the latching current phenomenon occurs when:
In a three-phase VSI (Voltage Source Inverter), if the modulation index (Ma) is 0.8 and DC link voltage is 400V, what is the peak phase voltage?
Which PWM technique provides the lowest THD in the output voltage of an inverter?
In a step-down DC-DC converter (buck), the inductor current ripple is ΔI = 2A at 100 kHz switching frequency. If D = 0.5 and Vi = 24V, what is the approximate inductance value?
Which cooling method is most effective for high-power semiconductor modules operating above 5 kW?