Automation System
The electronic component that has been the key to recent developments in automation is the:

diode
None of these
improved vacuum tube
transistor
integrated circuit

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

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

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Automation System
A solenoid:

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

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