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

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Power Systems
In hydroelectric power plants

 both operating and initial cost are low.
  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.
 both operating and initial cost are high.

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Power Systems
The draft tube is provided to

  increase the acting head on the water wheel.
 raise the water surface of the stream to create an artificial head.
None of these
 reduce the effect of water hammer.

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