Electronic Principles
What are the main parts of an atom?

Protons only
Electrons, ions, and neutrons
Electrons, protons, and neutrons
Electrons, protons, and ions
None of these

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity and at a steady level
The voltage reverses polarity periodically
The voltage causes current to flow in two directions at the same time
None of these
The voltage remains at one polarity but changes value periodically

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Electronic Principles
Which one of the following statements is true for the voltages in a series RL circuit?

The total voltage lags the total current by less than 90
None of these
The total voltage is less than the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit
The total voltages is equal to the sum of the voltages across the resistance and inductance

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Electronic Principles
When applying a square waveform to a capacitor, the circuit tends to:

peak the voltage and round off the current waveforms
peak the current and round off the voltage waveforms
round off both the voltage and current waveforms
None of these
peak both the voltage and current waveforms

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Electronic Principles
A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals
passes higher-frequency signals and reduces lower-frequency signals
reduces the level of all frequencies by a significant amount
None of these

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