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Power Systems

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

 5
 12
 6
 3

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Power Systems
On what factors does the selection of a water turbine depend

 Speed.
 Working head.
 Nature of load.
  All of above.

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Power Systems
The daily energy produced in thermal power station is 720 MWh at a load factor of 0.6. What is the maximum demand of the station?

 50 MW
 30 MW
 720 MW
 72 MW

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Power Systems
If R = 84 ohm/Km, G = 10-6 mho/Km, H = 0.01 H/Km, C = 0.061 μ F/Km and frequency = 1000 Hz, then what is the value of propagation constant of the transmission line

 0.01 + j 0.02 per Km.
 0.09 + j 0.018 per Km.
 0.018 per Km.
 None of them.

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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
Objectives of power system is/are

 Rated voltage and frequency has to be supplied to the consumers
 both 1 and 2
 Cost of electrical energy per KWh is to be minimum
 nether 1 nor 2

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