Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²-6x+1
 N = 3x²+3x+1
 N = 3x²-2x+1
 N = 3x²-3x+1

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Power Systems
Which of the following statements is true? Corona loss increases with

 increase in conductor size and decrease in supply frequency
 decrease in conductor size and increase in supply frequency
 decrease in conductor size and decrease in supply frequency
 increase in conductor size and increase in supply frequency

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Power Systems
An impulse turbine

  operates by initial complete conversion to kinetic energy.
 is most suited for low head and high discharge power plants.
 always operates submerged.
 makes use of a draft tube.

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