Automation System
An operational amplifier:

All of these
uses the principle of feedback
can be used to subtract two or more signals
can be used to sum two or more signals
None of these

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Automation System
A venturi tube:

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

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Automation System
Time proportioning control:

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

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Automation System
Most industrial control applications:

None of these
All of these
can be solved using more than one method of control
must have the process specified correctly to be successful
can be done more reliably using solid-state methods

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