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Power Systems

Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

  35 kVA.
 70 kVA.
  89.22 kVA.
 49 kVA.

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Power Systems
The charging current of a 400 kV line is more than that of a 220 kV line of the same length?

None of these
 True
 False
 either 1 or 2

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Power Systems
Units of incremental cost is

 Rs/MWhr
 MWhr/Rs
 RsMW/hr
 Rs/hr

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Power Systems
A power system network has n nodes, Z33 of its bus impedance matrix is j0.5 pu. The voltage at node 3 is 1.3∠ -10°. If capacitor is having reactance of -j3.5 pu is now added to the network between node 3 and reference node, the current drawn by the capacitor in pu is

 0.433∠ 80°
 0.325∠ -100°
 0.371∠ -100°
 0.725∠ 80°

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

 carona
 proximity effect
 skin effect
All of these

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Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLL
 LL
 LLG
 LG

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