Automation System
Operator interaction directly with the CRT is accomplished via:

None of these
a touch terminal
vector scanning
a stylus
a digitizing tablet

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

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

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Automation System
What is proportional control?

All of these
It has a discrete output for each error value
The controller output varies continuously over a range
None of these
The gain is independent of offset error.

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