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Power Systems

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

 less
 more
 either 1 or 2
None of these

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 83.76 kV
 48.36 kV
 20 kV
 52.84 kV

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Power Systems
Maximum power capacity of a transmission line can be increased by

 decreasing reactance value
 nether 1 nor 2
 either 1 or 2
 increasing voltage level

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Power Systems
The rating of fuse wire is always expressed in

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

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

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

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Power Systems
Advantages of higher transmission voltage is/are

 Transmission line losses are reduced
All of these
 Area of cross section and volume of the conductor is reduced
 Power transfer capability of the transmission line is increased

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