AC Fundamentals, Circuit and Circuit Theory
Pure inductive circuit takes power from the A.C. line when

Applied voltage decreases but current increases
Both applied voltage and current decrease
Both applied voltage and current increase
Applied voltage increases but current decreases

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

Both waves must have same frequency
None of the listed here
Both waves must have identical peak values
Both waves must have zero value at the same time

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