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

it is impossible to write a control program for a machine in any other logic
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
None of these

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Automation System
A stepping motor;

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

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Automation System
D/A (digital to analog) conversion:

must be fed through a filter to reproduce the original signal accurately
both (b) and (c)
has to be sampled at 1/2 the highest input frequency
results in a binary code as the final output
None of these

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