Automation System
What Is a process variable?

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

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Automation System
Stepping motors:

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

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Automation System
A venturi tube:

measures the presence of a liquid
is made only of metal
None of these
can be used to measure gas or liquid flow rates
is extremely difficult to use

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