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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 4
 8
 2
 5

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠°90 Ω, C = 0.5*10^-6∠90° â„§. Find Charging current under no load?

 0.344∠90° A/phase
 0.144∠90° A/phase
 1.144∠90° A/phase
 0.512∠90° A/phase

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Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

  5th harmonic current.
 3rd harmonic current.
 7th harmonic current.
 2nd harmonic current.

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Power Systems
What are the methods of laying underground cables?

  Both A and B.
 Direct laying.
 Draw - in - system / duct - pipe laying.
 None of these.

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Power Systems
The characteristic impedance of a transmission line is

 Directly proportional to square root of its length.
 Independent of its length.
 Inversely proportional to square root of its length.
 Directly proportional to its length.

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Power Systems
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

 1 / V.
 V2.
  1 / V2.
 V.

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