Automation System
A semi-continuous operation means:

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

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
All of these
are more powerful then the first controllers on the market
None of these
are relatively low cost compared with the original digital equipment available for industrial control

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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.
The beam constantly travels across the screen to turn on/off a series of pixels.
Makes changes on the image by increasing the anode voltage.
Uses an electron gun to continuously flood the surface of the tube.
None of these

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