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

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

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Automation System
Stepping motors:

can run both clockwise and counterclockwise
All of these
do not require commutators
can be built to index different amounts by changing the pole configuration
can run at varying speeds

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Automation System
What is proportional control?

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

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