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
The frequency of an alternating current is

The speed with which the alternator runs
The number of electrons passing through a point in one second
The number of waves passing through a point in one second
The number of cycles generated in one minute

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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,

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

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