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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 tanφ = R/X
 cosφ = X/R
 cosφ = R/X

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Power Systems
Mho relay is used for the protection of

  long transmission lines.
 no length criterion.
 medium length lines.
 short length lines.

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Power Systems
The conductor of a 10 Km long single phase, two wire line are separated by a distance of 1.5 m the diameter of each conductor the inductance of the circuit is

  23.8 mH.
 23.33 mH.
 21.2 mH.
 25.8 mH.

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Power Systems
Thermal shielding is provided to

All of these
 protected the operating personal from exposure to radiations.
 absorb the fast neutron.
 prevent the reactor wall from getting heated.

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Power Systems
A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F?

 2 F
 4 F
 0.5 F
 1 F

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Power Systems
Where air circuit breakers are used?

  Up to 11 kV.
  Up to 66 kV.
  Up to 33 kV.
  Up to 12 kV.

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