Automation System
An encoder:

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

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Automation System
A stepping motor;

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

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Automation System
A dc servo motor:

All of these
uses a variable dc voltage for speed control
can provide precise position control
uses a tachometer for speed feedback
None of these

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Automation System
Stepping motors:

can run both clockwise and counterclockwise
do not require commutators
can be built to index different amounts by changing the pole configuration
All of these
can run at varying speeds

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