Automation System
Four basic elements are required for an automated machine tool or production process. They are: input interface, memory, output interface and:

NC tape programming
None of these
software
computer graphics workstation
logic

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Automation System
Time proportioning control:

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

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Automation System
What is the difference between integral and derivative control?

None of these
derivative control does not eliminate offset error
All of these
integral control has slower response to an error signal.
derivative control responds to a change in the rate of change in the error signal

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