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

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

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Automation System
A solenoid:

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

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Automation System
How is the integral mode implemented on a digital controller?

None of these
All of these
the error is divided into discrete amounts
the error signal is summed over a discrete time interval and accumulated by the controller
the digital controller cannot handle integral mode

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