Automation System
Programmable controllers:

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

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Automation System
Most industrial control applications:

can be solved using more than one method of control
All of these
None of these
must have the process specified correctly to be successful
can be done more reliably using solid-state methods

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

None of these
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.
Uses an electron gun to continuously flood the surface of the tube.
Creates images on the screen by scanning straight-line vectors between selected points.

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Automation System
An operating system:

None of these
provides ability for other programmers to understand the software structure
can help reduce software development time
is useless in most control applications
All of these

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