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

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

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Power Systems
Gross head of an hydroelectric power station is

 all of above.
  the difference of water level between the level in storage and tail race.
 the height of water level in the river where the storage is provided.
 the height of water level in the river where the tail race is provided.

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