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Power Electronics
Inverter
PWM Control

Questions mapped to PWM Control under Inverter.

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Q#1 Inverter GATE EE 2006 (Set 1) MCQ +2 marks -0.66 marks

A single phase inverter is operated in PWM mode generating a single-pulse of width 2d in the center of each half cycle as shown in figure. It is found that the output voltage is free from 5th harmonic for pulse width 144°.  What will be percentage of 3rd harmonic present in the output voltage?


0.0 %

20.6 %

31.7 %

53.9 %

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Q#2 Inverter GATE EE 2003 (Set 1) MCQ +2 marks -0.66 marks

With reference to the output waveform given in Figure, the output of the converter will be free from 5th harmonic when

 

     

     

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Q#3 Inverter GATE EE 2000 (Set 1) MCQ +1 mark -0.33 marks

Triangular PWM control, when applied to a three phase, BJT based voltage source inverter, introduces

Low order harmonic voltages on the dc side

Very high order harmonic voltages on the dc side

Low order harmonic voltages on the ac side

Very high order harmonic voltage on the ac side

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Q#4 Inverter GATE EE 1999 (Set 1) MCQ +1 mark -0.33 marks

A PWM switching scheme is used with a three phase inverter to

Reduce the total harmonic distortion with modest filtering

Minimize the load on the DC side

Increase the life of the batteries

Reduce low order harmonics and increase high order harmonics

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