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Power Systems

Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.4
 0.5
 0.75
 0.25

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Power Systems
Reactance relays are used for the protection of

 short transmission lines only
All of these
 long transmission lines only
 medium transmission lines only

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Power Systems
Which of the following is not base load power plant

  Nuclear.
  Diesel.
  Pump storage.
  Run water.

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Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 cosφ = R/X
 tanφ = R/X
 cosφ = X/R

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Power Systems
The ground capacitance existing between transmission line and ground is 4µF. Find the inductive reactance of the peterson coil for compensation of arcing grounds?

 265.25 Ω
 0.844 Ω
 625.35 Ω
 855.26 Ω

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 9.936 pu
 8.936 pu
 7.936 pu
 10.936 pu

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