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

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

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Automation System
An encoder:

converts an input to a binary number
can have only four keys
None of these
is used to send telegraph signals
converts a binary number to a decimal number.

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