Automation System
A sequence controller:

None of these
is a mechanical only controller
is no longer in widespread use
is difficult to program
performs on/off control functions in relation to time.

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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.
All of these
None 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
Relay ladder logic is used in a PC because:

All of these
it is the best industrial control language ever developed.
None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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