Automation System
The main function(s) of computer in CAD is/are

To serve as an extension to the memory of the designer
To relieve the designer from routine repetitious tasks.
None of these
All of these
To enhance the analytical and logical power of the designer

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Automation System
The SKETCHPAD system

consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.
None of these
All of these
is used for interactive Graphics

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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
results in a binary code as the final output
has to be sampled at 1/2 the highest input frequency
both (b) and (c)

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