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

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

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

Combinations of resistance and capacitive reactance provide any opposition to current flow
The ac voltage leads the current by 90 degree
Resistances provide the only opposition to current flow
None of these
Capacitive reactance provides the only opposition to current flow

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

causing an ac phase shift greater than 90 degree
dissipating 1 W of power
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
None of these
storing 1 V for 1 second

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