Automation System
Compared to humans, machines:

(a) and (c)
can make more complex decisions based on unexpected circumstances
make fewer errors
can work in harsher environments
None of these

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Automation System
A semi-continuous operation means:

the operation is continuous each shift, but stops between shifts
a computer is a required part of the machine
coffee breaks are allowed for the operator
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these

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Automation System
Today, programmable controllers:

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
are more powerful then the first controllers on the market
None of these
All of these

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