Electronic Principles
Current and voltage are said to be in phase when:

None of these
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time
they have the same amplitude and frequency
All of these

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Electronic Principles
The total impedance of a parallel RLC circuit:

always decreases as the applied frequency increases
always increases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
None of these
is maximum at the resonant frequency

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