Electric Circuits
A 3 wire, 3 - φ supply feeds a load consisting of three equal resistors. By how much is the load reduced if one of the resistors be removed when the load is in star?

 25 % of the original load.
 33.33 % of the original load.
 66.66 % of the original load.
 50 % of the original load.

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Electric Circuits
A pole of driving point impedance is

 zero voltage for a finite value of driving current.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.
 zero current for a finite value of driving voltage.

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