Automation System
Time proportioning control:

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

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Automation System
A semi-continuous operation means:

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.
None of these
a computer is a required part of the machine
coffee breaks are allowed for the operator

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