Automation System
A proportional plus integral contro-ller can:

None of these
has no transient response
can compensate for lag
both (b) and (c)
can increase the system type

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

None of these
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

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