Automation System
Relay ladder logic is used in a PC because:

None of these
it is the best industrial control language ever developed.
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
All of these

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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
is used for interactive Graphics
None of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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Automation System
Ergonomics refers to:

the technology involved in the workstation itself
the human aspect of the environment around the workstation as well as the workstation itself
None of these
the level of involvement the operator has with the workstation
the cost relationship of the workstation versus productivity

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Automation System
Resolution in a CRT refers to:

the number of pixels in each square centimeter
None of these
the number of phosphor dots that react when hit by the electron beam
the number of addressable elements on the tube
the speed at which the monitor can accept data from the computer

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