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

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

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Power Systems
In coal fired thermal power stations, what are the electrostatic precipitators used for?

 To collect the dust particles from the flue gases
 To keep the air heaters clean
 To remove dust particles setting on the bus bar conductors in the station switch yard
All of these

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