Automation System
Time proportioning control:

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

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Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
are relatively low cost compared with the original digital equipment available for industrial control
can be cost effective even when replacing just a few relays
None of these
All of these

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