Power Systems
Which of following statement are false

 In a nuclear reactor, multiplication factor is kept almost equal to one.
  Nuclear power plants are used as peak load plants only.
 In nuclear power plants, chain reaction is controlled by cadmium rods.
 A thermal reactor needs a moderator material.

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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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