Automation System
Time proportioning control:

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

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Automation System
A venturi tube:

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

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Automation System
Stepping motors:

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

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