Automation System
A semi-continuous operation means:

coffee breaks are allowed for the operator
None of these
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
the operation is continuous each shift, but stops between shifts

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Automation System
Time proportioning control:

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

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Automation System
Numerical control:

None of these
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
applies only to milling machines
All of these

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