Automation System
A disadvantage of Numerical Control (NC) is:

the computer is not reliable
the machine tool can easily overheat
one operator is needed for each machine.
None of these
the tape and tape reader are not reliable

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Automation System
The SKETCHPAD system

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

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Automation System
Light sensors:

never use infrared light as light source
work in direct sunlight
cannot be used a s limit switches.
come in a wide variety of mounting styles
None of these

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