Automation System
The method of solid modeling that defines the topology of faces, edges, and vertics, as well as data that defines the surface in which each face lies is called:

None of these
constructive solid geometry
boundary representation
layering
isometric

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Automation System
Digital signals:

can have three possible levels
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
None of these
have a frequency measured in units of hertz

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

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

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