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

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

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Automation System
Programmable controllers:

are widely used in many different industries
(a) and (c) above
cannot perform functions other than relay logic
are programmed using relay ladder logic
None of these

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