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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 800 Ω
 400 Ω
 160 Ω
 200 Ω

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

 strain insulator
 pin insulator
All of these
 string insulator

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j1 pu
 j6 pu
 j3 pu
 j9 pu

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Power Systems
Which of the following is used in thermal plants

 Rankine cycle
 Joule cycle
All of these
 Otto cycle

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Power Systems
A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is

 1.182 mH
 1.232 mH
 1.043 mH
 1.093 mH

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Power Systems
Which of the following transformer is used in sub station for operating a protective relay?

 auto transformer
 capacitor voltage transformer
All of these
 distribution transformer

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