Automation System
An operating system:

is useless in most control applications
None of these
can help reduce software development time
provides ability for other programmers to understand the software structure
All of these

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Automation System
An encoder:

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

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

All of these
it is the best industrial control language ever developed.
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is impossible to write a control program for a machine in any other logic
None of these

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