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Power Systems

Power Systems
The annual depreciation of hydro power plant is about

 10 - 15 %.
 15 - 20 %.
 20 - 25 %.
  0.5 - 1.5 %.

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Power Systems
Which of the following is/are the stator faults?

 Inter phase faults
 failure of excitation
 over current
All of these

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 six
 three
 two

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Power Systems
Lightning arresters are made up of which material?

 silver
 any of the above
 silicon oxide
 copper

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Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / delta.
 star / grounded star.
  ground star / delta.
 delta / star.

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Power Systems
If skin depth is more, then skin effect is

 more
 less
None of these
 either 1 or 2

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