Automation System
Time proportioning control:

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

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Automation System
An encoder:

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

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