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

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Power Systems
The draft tube is provided to

 reduce the effect of water hammer.
  increase the acting head on the water wheel.
None of these
 raise the water surface of the stream to create an artificial head.

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