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Power Systems

Power Systems
Proximity effect is more in case of

 same in both cases
None of these
 power cables
 over head lines

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Power Systems
Which of following are the fertile materials

 U233 and Pu239.
  U238 and Th232.
 U238 and Th239.
 U238 and Pu239.

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Power Systems
The use of high speed circuit breakers

 reduces the short circuit current.
 increased the short circuit current.
  improves system stability.
 decrease system stability.

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 4.28 pu
 7.25 pu
 3.75 pu
 2.5 pu

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Power Systems
Under over excitation synchronous phase modifier works as

 series capacitor
 any of the above
 shunt reactor
 shunt capacitor

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Power Systems
The conductor carries more current on surface as compared to core. This is called as

 skin effect
 unsymmetrical fault
 corona effect
All of these

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