Automation System
An operating system:

All of these
None of these
provides ability for other programmers to understand the software structure
can help reduce software development time
is useless in most control applications

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Automation System
The program execution time:

All of these
will vary depending on the language used
None of these
must be slower than the fastest mechanical operation that is to be controlled
cannot be changed once the program is written

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Automation System
Time proportioning control:

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

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