Automation System
Light sensors:

work in direct sunlight
None of these
come in a wide variety of mounting styles
cannot be used a s limit switches.
never use infrared light as light source

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Automation System
An aneroid barometer

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.
can measure only atmospheric pressure

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Automation System
The refresh-vector CRT uses which of the following techniques?

Creates images on the screen by scanning straight-line vectors between selected points.
The beam constantly travels across the screen to turn on/off a series of pixels.
Uses an electron gun to continuously flood the surface of the tube.
Makes changes on the image by increasing the anode voltage.
None of these

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