Automation System
Light sensors:

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

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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.
None of these
Uses an electron gun to continuously flood the surface of the tube.
Makes changes on the image by increasing the anode voltage.
The beam constantly travels across the screen to turn on/off a series of pixels.

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Automation System
What is the difference between integral and derivative control?

derivative control responds to a change in the rate of change in the error signal
None of these
derivative control does not eliminate offset error
All of these
integral control has slower response to an error signal.

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