AC Fundamentals, Circuit and Circuit Theory
In a pure inductive circuit

The current can lead or lag by 90°
The current lags behind the voltage by 90°
The current leads the voltage by 90°
The current is in phase with the voltage

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

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

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AC Fundamentals, Circuit and Circuit Theory
Which of the following refers to a parallel circuit?

The equivalent resistance is greater than any one of the resistors
The current through any one element is less than the source current
The voltage across element is in proportion to it's resistance value
The current through each element is same

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AC Fundamentals, Circuit and Circuit Theory
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,

None of the listed here
Both resistance and inductance carry equal currents
The current through the resistance is less
The current through the resistance is more

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