Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

nicad cell
None of these
photodiode
piezoelectric device
solar cell

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Electronic Principles
The total impedance of a parallel RLC circuit:

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

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