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Power Systems

Power Systems
Galvanised steel is generally used as

All of these
 structural components.
 stray wire.
 earth wire.

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 6.25 A
 15 A
 12.5 A
 10 A

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Power Systems
Mho relay is usually employed for protection of

 medium transmission lines only
 long transmission lines only
 any line
 short transmission lines only

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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

 1.232 mH
 1.093 mH
 1.043 mH
 1.182 mH

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Power Systems
A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is

 31.7
 38.6
 35.45
 23.9

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Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 1.2 pu
 0.8, 0.6 and 1.2 pu
 0.6, 0.8 and 1.2 pu
 0.8, 0.8 and 1.2 pu

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