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

 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
 both 1 and 2
 nether 1 nor 2

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Power Systems
The factor affecting run off are

 the topography and nature of soil in the catchment area.
  all of above.
 rain fall pattern, shape and size of catchment area.
 amount of vegetation and weather condition in the catchment area.

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