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

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Automation System
Light sensors:

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

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Automation System
A solenoid:

is related to an aneroid
is widely used in industrial automation
is spring operated
can be used only in de circuits
None of these

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