Electrical Engineering: Power Electronics MCQ


26. Question

The current I flowing in the circuit shown below in amperes (round off to one decimal place) is ___________.




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27. Question

A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current is




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28. Question

A DC-DC converter shown below having switching frequency of 10 kHz with duty ratio 0.6. All the components are ideal and initial inductor current is zero. Energy stored in the inductor (in mJ) at the end of 10 switching cycles is




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29. Question

In AC voltage controller shown below. Thyristor T 1 is fired at α and T 2 is fired at 180° + α. To control the output power over range 0 to 2 kW. The minimum range of variation in α is




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30. Question

A 1-φ, fully controlled rectifier is connected to highly inductive RL load with R = 10 Ω at 230 V, 50 Hz. The source inductance is 2.28 mH. If the firing angle α = 45°, then the overlapping angle will be




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