Automation System
Time proportioning control:

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

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Automation System
A semi-continuous operation means:

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

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