Automation System
A stepping motor;

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

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Automation System
A solenoid:

None of these
can be used only in de circuits
is spring operated
is widely used in industrial automation
is related to an aneroid

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Automation System
An encoder:

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

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