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POWER SYSTEMS

Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 switching over voltage
 lighting voltage
 radio interference
 skin effect

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 75%
 90%
 86%%
 50%

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Power Systems
Which of the following insulator is practically used for railway crossings?

 pin insulator
All of these
 string insulator
 strain insulator

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Power Systems
Which of the following statements is/are true? By increasing of temperature,

 both 1 and 2
 tension decrease
 sag increase
 neither 1 nor 2

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Power Systems
Stock bridge dampers are used to

 reduce the vibrations at the point of support
 reduce the tension
 increase the sag
All of these

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