Automation System
Time proportioning control:

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

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Automation System
A venturi tube:

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

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