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Power Systems

Power Systems
In Francis turbine runner, the number blades is usually of the order of

 6 - 8.
 12 - 14.
  16 - 24.
 3 - 6.

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Power Systems
Which of the following plants has the maximum eapital cost

  Nuclear plants.
 Steam plants.
 Diesel plants.
 Hydro-plants.

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 negative sequence
 zero sequence
 any of the above
 positive sequence

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Power Systems
Fault calculations using computer are usually done by

 either 1 or 2
 Y bus method
 Z bus method
None of these

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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

  35 kA.
 50 kA.
 55 kA.
 45 kA.

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 5 + j 7 A
 1 + j 2 A
 1 + j 4 A
 -2 - j 1 A

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