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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-1)
 n×n
 (n-2)×(n-2)
 (n-1)×(n-2)

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Power Systems
If the diameter of the conductor is increased

 the resistance is increased
 the inductance is increased
 no change in inductance and resistance
 the inductance is decreased

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 8 MJ/MVA
 16 MJ/MVA
 4 MJ/MVA
 2 MJ/MVA

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Power Systems
Peak load power plants is/are

 pumped storage plant
 diesel plant
 nuclear plants
 both 1 and 2

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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?

 -18.18 kV
 81.82 kV
 18.18 kV
 -81.82 kV

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 G-S method
 Decoupled method
All of these
 N-R method

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