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Power Systems

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

 less
 more
None of these
 either 1 or 2

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Power Systems
Counter poise is used for

 less surge impedance
 reduce losses
 more surge impedance
 proper discharging of lighting surges

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

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Power Systems
Critical visual voltage is the voltage at which

 both 1 and 2
 corona is visible with blue or violet colour
None of these
 corona is just initiated

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Power Systems
A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

 0.85 Hz
 0.76 Hz
 -0.85 Hz
 -0.76 Hz

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Power Systems
The rating of fuse wire is always expressed in

  kWh.
  ampere-hours.
  ampere-volts.
  amperes.

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