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Power Systems

Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

  89.22 kVA.
  35 kVA.
 49 kVA.
 70 kVA.

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j1 pu
 j9 pu
 j6 pu
 j3 pu

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Power Systems
Gas turbine power plants for maximum efficient may have

 Heat exchangers.
  All of above.
 Multistage compression.
 Reheating.

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Power Systems
The generating station suitable to operate as peak load plant is

  Pumped storage.
 Nuclear power station.
 Thermal power station.
 Power station.

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Power Systems
Find the propagation constant, if impedance is 10Ω and admittance is 10 â„§?

 1
 100
 5
 10

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 7.936 pu
 9.936 pu
 10.936 pu
 8.936 pu

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