Automation System
Digital signals:

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

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Automation System
Pressure sensors:

use the piezoresistive effect in strain gauge sensors
None of these
use capacitive variations to sense pressure
All of these
use an aneroid chamber with a variable resistance output

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Automation System
Resolution in a CRT refers to:

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

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