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

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

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Power Systems
A sodium graphite reactors use

 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as coolant.
  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as moderator.

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