Automation System
A stepping motor;

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

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Automation System
Programmable controllers:

None of these
cannot perform functions other than relay logic
(a) and (c) above
are widely used in many different industries
are programmed using relay ladder logic

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Automation System
Light sensors:

None of these
come in a wide variety of mounting styles
work in direct sunlight
never use infrared light as light source
cannot be used a s limit switches.

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