Automation System
A solenoid:

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

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Automation System
Pressure sensors:

use capacitive variations to sense pressure
use the piezoresistive effect in strain gauge sensors
use an aneroid chamber with a variable resistance output
All of these
None of these

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Automation System
Light sensors:

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

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
All of these
None of these
the difference between the control setpoint value and the actual value.
the difference between the controller output and the setting of the manipulated variable.

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