Automation System
An encoder:

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

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

None of these
having each electron gun controlled by a composite signal
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

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