Automation System
Which of the following is often used as an alternative to the light pen or in association with storage tube displays?

Digitiser
Track ball
Tablet
None of these
Mouse

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Automation System
Digital signals:

can have three possible levels
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level
None of these
have a sinusoidal shape.

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