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

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

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
a and b above.
is less efficient than normal PID control
None of these
can be used on a PM550 programmable process controller

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