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Power Systems

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

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

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

  5100 MVA.
  5000 MVA.
 5500 MVA.
 5200 MVA.

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Power Systems
Which of the following power plants can generate power at unpredictable or uncontrollable time

 Cooling tower.
 Wind turbine.
 Pulverising unit.
 Condenser.

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Power Systems
Making and breaking currents of 3 phase AC circuit breakers in power system are respectively in what form?

 Instantaneous and RMS value
 RMS and Instantaneous value
 RMS and RMS value
 any of the above

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Power Systems
Which of following are the fertile materials

 U238 and Th239.
 U238 and Pu239.
  U238 and Th232.
 U233 and Pu239.

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Power Systems
Which of following materials can be used as coolant

 CO2.
 Helium.
  Any of above.
 Heavy water.

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