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Power Systems

Power Systems
Fault calculations using computer are usually done by

 Y bus method
None of these
 either 1 or 2
 Z bus method

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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 pu
 7 pu
 3.535 pu
 5.353 pu

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Power Systems
In a nuclear reactor, chain reactor is controlled by introducing

  cadmium rods.
 iron rods.
 brass rods.
 graphite rods.

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Power Systems
Demand factor of a plant is

 0
 greater than 1
 1
 less than 1

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

 √(1 + Kcsh)/Zs
 Zs/√(1 + Kcsh)
 Zs*√(1 + Kcsh)
All of these

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Power Systems
In a 400 kV power network, 360 kV is recorded at 400 kV bus. The reactive power absorbed by a shunt reactor for 50 MVAr, 400 kV connected at the bus is

 55.56 MVAr.
 45.0 MVAr.
 61.73 MVAr.
  40.5 MVAr.

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