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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LL
 LLL
 LLG
 LG

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Power Systems
The value of inductance used for compensation of arcing grounds is

 ω²C/3
 1/3ω²C
 3ω²C
 3/ω²C

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 28 Ω
 40 Ω
 52 Ω
 33 Ω

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Power Systems
Under excited Synchronous phase modifier works as

 shunt capacitor
 any of the above
 shunt reactor
 series capacitor

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 5.353 pu
 3.535 pu
 7 pu
 5 pu

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Power Systems
In a short circuit test circuit breaker, time to reach the peak re-striking voltage 60 microsecond & the peak re-striking voltage 120 kV. Determine average RRRV (Rate of rise re-striking voltage)?

 1 × 106 kV / sec.
 3.5 × 106 kV / sec.
  2 × 106 kV / sec.
  3 × 106 kV / sec.

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