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

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

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Electronic Principles
The period of a waveform is:

equal to 0.707 times the peak amplitude
the time required for the voltage to rise from 10% to 90% of the peak amplitude
the number of cycles completed in one second
the time required to complete one full cycle
None of these

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Electronic Principles
Which one of the following statements is true for resistance in a parallel circuit?

The total resistance of a parallel circuit is always less than the value of the smallest resistance
The total resistance in a parallel circuit is equal to the average value of the individual resistances
None of these
The total resistance of a parallel circuit is equal to the total voltage
The total resistance is equal to the sum of the individual resistances in a parallel circuit.

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Electronic Principles
Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
The rate of change of the number of lines of magnetic force
The opposition to a build-up of magnetic fields
The force that maintains lines of force
None of these

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