Power Systems
The radiation shield for a nuclear power reactor for biological safety is provided by having the reactor

  encased by thick concrete wall.
 isolated from outside word with strong magnetic field.
 encased thick metal wall.
 immersed in water pool.

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

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