Automation System
D/A (digital to analog) conversion:

has to be sampled at 1/2 the highest input frequency
both (b) and (c)
results in a binary code as the final output
None of these
must be fed through a filter to reproduce the original signal accurately

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Automation System
Numerical control:

All of these
None of these
applies only to milling machines
is a method for controlling the operation of a machine by means of a set of instructions
is a method for producing an exact number of parts per hour

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

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