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

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

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Automation System
Digital signals:

can have three possible levels
None of these
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
have a frequency measured in units of hertz

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Automation System
Resolution in a CRT refers to:

the speed at which the monitor can accept data from the computer
the number of phosphor dots that react when hit by the electron beam
None of these
the number of addressable elements on the tube
the number of pixels in each square centimeter

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