Automation System
The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:

concerned with management programs
designed for communications
None of these
concerned with production and control of tool design
specifically for PC-board design

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Automation System
Time proportioning control:

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

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Automation System
An aneroid barometer

can measure only atmospheric pressure
is very unreliable
None of these
measures pressure by sensing deflection of an evacuated chambers.
can be used to measure gas or liquid flow rates

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