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

All 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
None of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
A process controller:

is useful in a continuous process control application
can solve a PID process control equation easily
All of these
None of these
can interface to digital and analog I/O

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Automation System
An encoder:

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

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