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

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
All 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 stepping motor;

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

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Automation System
A semi-continuous operation means:

coffee breaks are allowed for the operator
None of these
a computer is a required part of the machine
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
the operation is continuous each shift, but stops between shifts

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