AC Fundamentals, Circuit and Circuit Theory
Pure inductive circuit

Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
Does not take power at all from a line
None of the listed here
Consumes some power on average

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AC Fundamentals, Circuit and Circuit Theory
Time constant of a capacitive circuit

Increases with the increase of capacitance and decrease of resistance
Increases with the decrease of capacitance and decrease of resistance
Increases with the decrease of capacitance and increase of resistance
Increase with increase of capacitance and increase of resistance

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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

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

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