Automation System
Relay ladder logic is used in a PC because:

it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these
it is the best industrial control language ever developed.
None of these

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

None of these
both (b) and (c)
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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