Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

from zero to its rms value
from 10% of the peak value to 90% of the peak value
from zero to its peak value
None of these
from 10% of the peak value to 70.7% of the peak value

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

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Electronic Principles
What is a free electron?

An electron that costs nothing
An electron that has no electrical charge
None of these
An electron that has twice the amount of charge of a normal electron
An electron that has been freed from its parent atom

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