If
a voltage controlled bus is treated as a load bus, then which one of the
following limits would be violated?
Voltage
Active
power
Reactive power
Phase
Angle
Reactive power
Specified
Load
bus 
Voltage
controlled bus P,|V|
Hence,
If a voltage controlled bus is treated as a load bus, then reactive power
limits would be violated.
Hence,
the correct option is (C).
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