Automation System
The hardware device Jhat acts as both a switching and connecting unit is called a(n):

communications processor
RS-232C port
concentrator
None of these
multiplexer

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Automation System
Time proportioning control:

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

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Automation System
An aneroid barometer

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

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