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

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

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Automation System
A stepping motor;

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

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Automation System
A dc servo motor:

None of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
can provide precise position control
All of these

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