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Power Systems

Power Systems
The insulator thickness on the conductor, in cables depends upon

 power factor
 voltage
 reactive power
 current

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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (MVA)b/(KV)²b
 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b*100/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)

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Power Systems
A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is

 23.9
 35.45
 38.6
 31.7

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Power Systems
Oxide film arrestor has which of the following properties?

 Both A and B.
 Installed at points of transmission line where daily visit is difficult.
 Does not require daily charging.
 It is expensive.

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Power Systems
By using guard ring in a transmission line, its string efficiency

 remains unaffected
 increase
 decrease
None of these

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j1 pu
 j6 pu
 j9 pu
 j3 pu

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