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

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

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Electronic Principles
One henry of inductance is defined as:

the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of counter emf required to reduce a current to 1 A
None of these
the amount of inductance required to change the frequency of a current by 1 Hz

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

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