Automation System
Digital signals:

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

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Automation System
A flip-flop:

(a) and (c)
remembers what was previously stored in it
is a combinational logic device
is a sequential logic device
None of these

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Automation System
A process controller:

is useful in a continuous process control application
None of these
can interface to digital and analog I/O
All of these
can solve a PID process control equation easily

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