Automation System
The two types of relays in a PC are:

a retentive relay and a non-retentive relay
a control relay and a retentive relay
an output relay and a control relay
None of these
All of these

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

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

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