Power Systems
In load flow studies PV bus is treated as PQ bus when

 reactive power goes beyond limit
 any of the above
 phase angle become high
 voltage at the bus become high

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Power Systems
Gas coolled reactor

 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
 use CO2. or helium as coolant and graphite the moderator.
  both B and C.
 use heavy water as coolant as well as moderator.

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