Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

 (5 + j10 / 3) Ω.
 (20 + j10) Ω.
  (10 + j30) Ω.
 40 Ω.

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Electric Circuits
What is time period T?

 Time taken by an alternating quantity to complete the (-)ve half.
 Time taken by an alternating quantity to complete the (+)ve half.
 Time taken by an alternating quantity to complete one full cycle.
 Time taken by an alternating quantity to reach the peak value.

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