Power Systems
In a nuclear reactor, chain reactor is controlled by introducing

 brass rods.
 graphite rods.
  cadmium rods.
 iron rods.

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

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

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