Power Systems
The arc voltage produced in an AC circuit breaker is always

 leading the arc current by 90°.
  in phase with the arc current.
 lagging the arc current by 90°.
 in phase opposition with the arc current.

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Power Systems
Gas coolled reactor

 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
  both B and C.
 use heavy water as coolant as well as moderator.
 use CO2. or helium as coolant and graphite the moderator.

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