Automation System
A common way to take x, y coordinates off a drawing is to use a

Tablet
None of these
Direct view storage tube (DVST)
light pen
digitiser

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

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

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