Automation System
The coordinate system used to describe a workpiece:

is always two-dimensional
changes from part to part
is defined with respect to a point on the machine
None of these
All of these

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Automation System
What is proportional control?

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

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Automation System
Time proportioning control:

a and b above.
cannot use a TM990 micro¬computer
can be used on a PM550 programmable process controller
is less efficient than normal PID control
None of these

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