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Power Systems

Power Systems
Ferranti effect occurs under

 any of the above
 half load
 full load
 no load

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Power Systems
The charging reactance of 50 km transmission line is 1500 Ω. What is the charging reactance for 100 km length of line?

 3000 Ω
 1000 Ω
 750 Ω
 1500 Ω

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 0.6 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.6 and 1.2 pu

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

  oil.
  air blast.
  vacuum.
  SF6.

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Power Systems
The ground capacitance existing between transmission line and ground is 4µF. Find the inductive reactance of the peterson coil for compensation of arcing grounds?

 625.35 Ω
 265.25 Ω
 855.26 Ω
 0.844 Ω

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0.5
 0 leading
 0.707 leading
 unity

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