Electronic Principles
What kind of battery is most likely included in a cordless electric knife?

Lead-acid battery
Mercury-cell battery
Zinc-carbon battery
Nicad battery
None of these

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is less than the sum of the resistance and capacitive reactance
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than either the resistance or capacitive reactance but less than their sum
The impedance is greater than the sum of the resistance and capacitive reactance
None of these

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Electronic Principles
Which one of the following statements most accurately applies to the frequency of a waveform?

The actual frequency of a sine waveform is 1.41 times the working frequency
The longer the period of a waveform, the lower its frequency
The higher the amplitude of a waveform, the higher its frequency
None of these
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

Combinations of resistance and inductive reactance provide any opposition to current flow
The ac voltage lags the current by 90 degree
None of these
Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow

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