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
Semiconductor devices:

All of these
usually have a very short MTBF (mean time between failure)
None of these
are less reliable than electro¬mechanical components
have a very short infant mortality period

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