Automation System
Flood guns bombard the phosphor surface of the tube in which one of the following types of CRT technology?

Refresh-vector CRT
Stroke CRT
Raster scan CRT
Direct view storage tube
None of these

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Automation System
Semiconductor devices:

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

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