Automation System
Historically, central systems were used because:

semiconductor memory was not available
memory was very expensive
memory consumed a large amount of power
None of these
All of these

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Automation System
Time proportioning control:

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
a and b above.

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Automation System
Today, programmable controllers:

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

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