Automation System
A programmable controller:

is easier to troubleshoot than standard relay logic
allows faster machine checkout
None of these
both (a) and (b)
All of these

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Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
can have three possible levels
None of these
have a sinusoidal shape.
have a frequency measured in units of hertz

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Automation System
Most industrial control applications:

can be solved using more than one method of control
can be done more reliably using solid-state methods
All of these
must have the process specified correctly to be successful
None of these

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