Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of minimum.
  zero.
  one - third of maximum.
  two - thirds of maximum.

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with negative sign
 which is connected between bus i and bus j with positive sign
 sum of admittances connected at bus i
 sum of admittances connected at bus j

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Power Systems
The factor affecting run off are

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

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