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
using an in-line gun arrangement with a solid metal mesh
grouping the phosphor dots in a circular pattern
None of these

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Automation System
Stepping motors:

do not require commutators
All of these
can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration
can run at varying speeds

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