Automation System
A programmable controller:

allows faster machine checkout
both (a) and (b)
is easier to troubleshoot than standard relay logic
None of these
All of these

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Automation System
What is offset error?

the difference between the controller output and the setting of the manipulated variable.
All of these
the difference between the sensor input and the absolute sensed parameter.
the difference between the control setpoint value and the actual value.
None of these

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

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

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Automation System
A stepping motor;

None of these
can index positional movement.
has a speed proportional to voltage input
has a commutator
is a good choice where continuous rotation is needed

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