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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 three
 six
 two

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Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.25
 0.4
 0.75
 0.5

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Power Systems
Transmission line has a length of 300 km, operating at sending end voltage Vs = 1 pu, find the receiving end voltage(Vr) at no load?

 1 pu
 0.98 pu
 1.098 pu
 0.098 pu

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Power Systems
Peak load power plants is/are

 pumped storage plant
 both 1 and 2
 diesel plant
 nuclear plants

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the reflected voltage?

 81.82 kV
 -81.82 kV
 18.18 kV
 -18.18 kV

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Power Systems
The average thermal efficiency of a modern nuclear power plant is about

 80 %.
 60 %.
  30 %.
 40 %.

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