AC Fundamentals, Circuit and Circuit Theory
A parallel AC. circuit in resonance will

Have a high impedance
Have a high voltage developed across each inductive and capacitive section
Have current in each section equal to the line current
Act like a resistor of low value

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AC Fundamentals, Circuit and Circuit Theory
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value

Will change the maximum value of current at resonance
Will increase the selectivity of the circuit
Will change the resonance frequency
Will change the impedance at resonance frequency

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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 same frequency
Both waves must have zero value at the same time
Both waves must have identical peak values

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