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Power Systems

Power Systems
Making current is a------------ value?

 any of the above
 peak value
 average
 RMS

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 15%
 11.8%
 88.2%
 85%

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.0030
 0.30
 0.0060
 0.60

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Power Systems
When a pumped storage power plant is operated in conjunction with a steam power plant

 the operating cost of the steam plant become optimum
 chances of the tripping of the system decrease
All of these
 load factor of the steam plant is increased

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Power Systems
Which material is used in controlling chain reaction in a nuclear reactor

 Thorium.
 Heavy water.
  Boron.
 Beryllium.

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Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 400 MW
 200 MW
 800 MW
 1600 MW

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