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

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Automation System
Stepping motors:

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

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Automation System
A venturi tube:

is made only of metal
measures the presence of a liquid
can be used to measure gas or liquid flow rates
is extremely difficult to use
None of these

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