Power Systems
Which of the following statement is/are true?Zn

 both 1 and 2
 nether 1 nor 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

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Power Systems
Gas coolled reactor

 use heavy water as coolant as well as moderator.
  both B and C.
 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.

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