Automation System
Historically, central systems were used because:

None of these
memory was very expensive
All of these
semiconductor memory was not available
memory consumed a large amount of power

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
it is the best industrial control language ever developed.
All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
A process controller:

can interface to digital and analog I/O
is useful in a continuous process control application
None of these
All of these
can solve a PID process control equation easily

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

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

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