Answer / ankush

A control t/f is one which gives constant o/p voltage and
current , so known as control t/f.
These are basicaly used in electronics circuits.
while PT are used for the measurement of voltages.
so simple......

Answer / k.prakashchandra

PT/VT are voltage measurement.Control Tr is for supplying
power to control or auxiliary equipments which can not be
used on regular available supply.

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