Automation System
D/A (digital to analog) conversion:

both (b) and (c)
None of these
must be fed through a filter to reproduce the original signal accurately
results in a binary code as the final output
has to be sampled at 1/2 the highest input frequency

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Automation System
A flip-flop:

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

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Automation System
A process controller:

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

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