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POWER SYSTEMS

Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 840 Ω
 400 Ω
 420 Ω
 210 Ω

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Power Systems
Which of the following represents the sag(S) of a transmission line?

 S = wl²/8T
 S = wl²/16T
 S = wl²/2T
 S = wl²/4T

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 16 MΩ
 8 MΩ
 4 MΩ
 32 MΩ

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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
 35.45
 38.6
 23.9

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Power Systems
A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is

 0.0312 m/s
 32 m/s
 159.24 m/µs
 159.24 m/s

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