Automation System
A venturi tube:

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

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

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
having each electron gun controlled by a composite signal

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Automation System
Stepping motors:

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

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