Power Systems
If in a line, resistance and reactance are found to be equal and regulation is zero, then load will have

 0.707 lagging power factor
 unity power factor
 zero power factor
 0.707 leading power factor

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Power Systems
The draft tube is provided to

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

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