Power Systems
The inductance of single phase two wire line is given by

 0.4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m
 4×10-7× ln(r'/d) H/m
 4×10-7× ln(d/r') H/m

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Power Systems
Gas coolled reactor

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

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