Automation System
Programmable controllers:

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

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Automation System
Microcomputer-based control sys-tems

will just keep their present capability
All of these
None of these
will have more standard industrial application software available in the future.
will tend to increase in cost.

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Automation System
A sequence controller:

None of these
is difficult to program
is a mechanical only controller
is no longer in widespread use
performs on/off control functions in relation to time.

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Automation System
In raster-scan colour monitors, colour can be intensified by:

having each electron gun controlled by separate signal
grouping the phosphor dots in a circular pattern
None of these
having each electron gun controlled by a composite signal
using an in-line gun arrangement with a solid metal mesh

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