Automation System
A drum timer is a good example of:

an output actuator
None of these
a position sensor
a sequence controller
an input sensor

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Automation System
High-level languages:

are "procedure-oriented"
require knowledge of the computer design
cannot be used with automatic systems.
are very difficult to use
None of these

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Automation System
Light sensors:

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

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