Automation System
Time proportioning control:

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

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Automation System
Trend analysis:

None of these
is a brand new concept
is used only in financial planning
can improve control system response
requires a very expensive system to implement

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Automation System
A semi-continuous operation means:

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

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