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
The refresh-vector CRT uses which of the following techniques?

Creates images on the screen by scanning straight-line vectors between selected points.
Makes changes on the image by increasing the anode voltage.
Uses an electron gun to continuously flood the surface of the tube.
The beam constantly travels across the screen to turn on/off a series of pixels.
None of these

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Automation System
A semi-continuous operation means:

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
None of these
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.

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