Electronic Principles
To get the Thevenin voltage, you have to

Short the voltage source
Open the load resister
Short the load resistor
Open the voltage source
None of these

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Electronic Principles
A low-pass filter:

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

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