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Power Systems

Power Systems
Skin effect depends on

 frequency
 relative permeability
 conductivity
All of these

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Power Systems
To reduce the radio interference which line is/are transposed?

 either 1 or 2
 Power line
 Both power and telecommunication lines
None of these

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Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 16.
 12.
 6.
  24.

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Power Systems
The corona loss on a particular system at 50 Hz is 1 kW/km per phase. What is the corona loss at 60 Hz in kW/km per phase?

 1
 0.89
 1.13
 1.25

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Power Systems
Which of the following power stations is mainly used to cover peak load on the system?

 coal based thermal power plant
 pumped storage hydro power plant
 nuclear plant
 gas based thermal power plant

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 30-40%
 60-70%
 20-25%
 45-55%

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