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Power Systems

Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 1
 0.75
 0.25
 0.5

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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

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

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Power Systems
Peak load power plants is/are

 diesel plant
 nuclear plants
 pumped storage plant
 both 1 and 2

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Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LG
 LL
 LLL
 LLG

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

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

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Power Systems
For a 500 Hz frequency excitation, a 100 km long power line will be modelled as

 shunt capacitor
 medium transmission line
 long transmission line
 any of the above

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