Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² + 3x + 1
 Total number of strands N = 3x² - 3x - 1
 Total number of strands N = 3x² + 3x - 1

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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 the mutual couplings between transmission lines are absent
 always
 if both 2 and 3 are satisfied

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