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Power Systems

Power Systems
Normally Z bus matrix is a

 null matrix
 sparse matrix
 full matrix
 unit matrix

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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?

 3.535 pu
 5 pu
 5.353 pu
 7 pu

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 100 MVA
 400 MVA
 125 MVA
 500 MVA

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Power Systems
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

 V.
 V2.
 1 / V.
  1 / V2.

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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
Tarapur nuclear power plant has which type of reactor?

 CANDU type reactors.
 None of these.
 Pressurized water reactors.
 Boiling water type.

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