Automation System
What Is a process variable?

A process parameter that changes value
All of these
None of these
A controlled variable
A manipulated variable

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Automation System
Pressure sensors:

All of these
use the piezoresistive effect in strain gauge sensors
None of these
use an aneroid chamber with a variable resistance output
use capacitive variations to sense pressure

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Automation System
What is proportional control?

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

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