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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 1
 0
 α²
 α

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

 45 kA.
  35 kA.
 55 kA.
 50 kA.

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.075 pu.
 0.125 pu.
 0.200 pu.
  3.000 pu.

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Power Systems
For variable heads of near about but less than 30 m, which type of turbines is used hydro power plant

 Francis.
  Kaplan.
 Pelton.
 None of above.

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Power Systems
A network containing 100 buses in which 10 are the voltage control buses, 5 are fixed shunt capacitor buses, 20 are the reactive power support buses, 6 are the generator buses. Find the size of the Jacobian matrix?

 163 × 163
 165 × 165
 162 × 162
 164 × 164

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Power Systems
The main advantage of the Decoupled Load Flow (DLF) as compared to the NR method is

 reduced memory requirements in storing the Jacobian elements
 accuracy is more
 number of iterations are less
All of these

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