Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 always
 if the mutual couplings between transmission lines are absent
 if both 2 and 3 are satisfied
 if the shunt admittances at the buses are ignored

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Power Systems
Gas coolled reactor

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

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