Automation System
An encoder:

can have only four keys
None of these
converts a binary number to a decimal number.
converts an input to a binary number
is used to send telegraph signals

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Automation System
Time proportioning control:

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

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