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Answer Posted / y.vidya sagar
AVR is Automatic Voltage Regulator and is essentially an
autotransformer and has two windings in it namely exciting
winding and series winding.
Exciting windimg is connected in parallel with the circuit
and the series winding is in series with the circuit.
series winding has tappings on it variation of which leads
to variation in the voltage at the secondary side.
It can boost aswellas buck the voltage depending on the
connection of the reversing switch that connects the series
winding to the ckt.
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