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

None of these
using an in-line gun arrangement with a solid metal mesh
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

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Automation System
A stepping motor;

has a speed proportional to voltage input
is a good choice where continuous rotation is needed
None of these
can index positional movement.
has a commutator

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