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

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

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Automation System
Semiconductor devices:

are less reliable than electro¬mechanical components
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
None of these
All of these

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