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Power Systems

Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 3
 6
 12
 5

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Power Systems
A generator has a rating of 10 MVA, 5 kV has a reactance of 0.02 pu. Find the reactance at a new base values of 50 MVA, 10 kV?

 0.02
 0.25
 0.025
 0.05

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Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² - 3x - 1
 Total number of strands N = 3x² + 3x - 1
 Total number of strands N = 3x² + 3x + 1

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Power Systems
Alternate formation and breakage of bubbles are called

  water hamming.
  cavitations.
All of these
  surgfication.

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Power Systems
What is the function of economiser in steam boilers

All of these
 cooling
 improving thermal efficiency
 collect ash particals

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Power Systems
Corona is accompanied by

 hissing sound
 power loss and interference
 violet visible light
All of these

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