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Power Systems

Power Systems
Surge impedance loading (SIL) is represented by

 Vph²/Zs
 Vl²*√(C/L)
 both 1 and 2
 Vl²/Zs

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Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 45°
 36°
 90°
 42°

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Power Systems
For a lossy transmission line, the characteristic impedance does not depend on

 The load terminating the line.
 The operating frequency of the line.
 The conductivity of conductors.
 The permittivity of the dielectric separating the conductor.

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Power Systems
The main objectives of power system is/are

 Flexible power has to be available.
 Reliable power has to be available
All of these
 Cost of electrical energy per KWh is to be minimum

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Power Systems
Which of the following statements is/are true regarding HVDC?

 There is no skin effect in dc line
 Corona loss is very much reduced in the dc line
All of these
 HVDC can utilize earth for its return path

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" < X' < X
 X" > X' >X
 X" > X' < X
 X" < X' > X

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