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Power Systems

Power Systems
Transmission line parameters of the short transmission line are

 1,0,Y,1
 1,Z,0,1
 1,Z,Y,1
 Z,0,Y,1

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 16 MΩ
 4 MΩ
 32 MΩ
 8 MΩ

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Power Systems
In load flow studies PV bus is treated as PQ bus when

 phase angle become high
 reactive power goes beyond limit
 voltage at the bus become high
 any of the above

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 0.2 pu
 0.25 pu
 5 pu
 1 pu

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 15 A
 10 A
 12.5 A
 6.25 A

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Power Systems
Generation of of one watt needs about ______________ fission per second

 3.1.
 3.1 × 106.
 3.1 × 107.
  3.1 × 1010.

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