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A three-phase AC to DC diode bridge rectifier is supplying from a three-phase, 440 V source. The rectifier supplies a purely resistive load. The average DC voltage across the load will be V

Assuming a three-phase bridge rectifier with a purely resistive load, the average output voltage can be calculated using the formula:

Vdc = (3√2/π) * Vp

where Vp is the peak voltage of the input AC voltage.

As you have mentioned, the RMS voltage of the input AC voltage is 440 V, which means the peak voltage can be calculated as:

Vp = √2 * Vrms = √2 * 440 = 622.25 V

Using this value for Vp, the average output voltage can be calculated as:

Vdc = (3√2/π) * Vp = (3√2/π) * 622.25 ≈ 1029.20 V

So, the average output voltage of the three-phase bridge rectifier is approximately 1029.20 V.