Automation System
The SKETCHPAD system

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

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Automation System
A semi-continuous operation means:

each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these
a computer is a required part of the machine
the operation is continuous each shift, but stops between shifts
coffee breaks are allowed for the operator

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Automation System
What is proportional control?

It has a discrete output for each error value
All of these
None of these
The gain is independent of offset error.
The controller output varies continuously over a range

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