Power Systems
Where is the draft tube of a hydroelectric plant that is an airtight pipe located

 In between the runner exhaust and the tail race.
  In between the penstock and runner.
 At the beginning of the penstock.
 Near the surge tank.

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

  raising the value of K above 1, but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.
 lowering the value of K below 1 but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.

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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 j
 sum of admittances connected at bus i

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