Three phase IGBT inverter under sinusoidal PWM control

Answer the questions given below (refer Fig.2):


Fig. 2 Circuit diagram of three-phase bridge inverter


1. In a three-phase inverter operating in square wave mode, the output voltage waveform contains
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2. The load voltage frequency is equal to
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3. The supply voltage is maintained constant in inverter by placing
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4. In a three-phase inverter, how many minimum number of switching devices are required?

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5. The pulse width modulation control technique in inverters is used for
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