Q. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of
✅ Correct Answer: (A)
Diode and capacitor
Power Electronics MCQs | Page - 2
Dear candidates you will find MCQ questions of Power Electronics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. During the commutation period in 3 phase converter, overlap time is
✅ Correct Answer: (C)
Dependent on both the load current and load voltage behind the short circuit current
Q. In a three phase converter, the number of notches per cycle is
✅ Correct Answer: (C)
Six
Q. Unipolar modulation is generally used in
✅ Correct Answer: (D)
DC - DC converters
Q. Very large values of modulation index (greater than 3.24) lead to
✅ Correct Answer: (A)
Square AC output voltage
Q. With increase in firing angle
✅ Correct Answer: (B)
Harmonic distortion increases and quality of input current decreases
Q. The advantage of using free - wheeling diode in half controlled bridge converter is that
✅ Correct Answer: (A)
There is always a path for the dc current independent of the ac line
Q. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is
✅ Correct Answer: (B)
Square wave
Q. A full wave rectifier with resistive load produces
✅ Correct Answer: (D)
Do not produce harmonics
Q. If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered
✅ Correct Answer: (B)
60 degree after the zero crossing of the corresponding line voltages
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