Automation System
An operational amplifier:

uses the principle of feedback
can be used to sum two or more signals
can be used to subtract two or more signals
All of these
None of these

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

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

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