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

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

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

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

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