Automation System
Time proportioning control:

None of these
is less efficient than normal PID control
cannot use a TM990 micro¬computer
a and b above.
can be used on a PM550 programmable process controller

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Automation System
Digital signals:

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

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Automation System
A continuous process is:

None of these
one that never shuts down
used only for simple tasks
used only with analog controllers.
self-contained in that raw materials enter the process and an identifiable products exits the process.

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