1.

A step-down delta-star transformer, with per-phase turns ratio of 5 is fed from a 3-phase 1100 V, 50 Hz source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding feeding an R load. Find the average value of output voltage.

A. 220 V
B. 257 V
C. 1100/√3 V
D. 206 V
Answer» C. 1100/√3 V


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