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

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

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Automation System
A dc servo motor:

uses a variable dc voltage for speed control
can provide precise position control
None of these
uses a tachometer for speed feedback
All of these

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
are relatively low cost compared with the original digital equipment available for industrial control
All of these
are more powerful then the first controllers on the market
None of these

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