Automation System
Trend analysis:

requires a very expensive system to implement
can improve control system response
is used only in financial planning
None of these
is a brand new concept

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Automation System
Light sensors:

cannot be used a s limit switches.
come in a wide variety of mounting styles
work in direct sunlight
None of these
never use infrared light as light source

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

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

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Automation System
Stepping motors:

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

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