Automation System
Most continuous control actuators:

use a 4 to 20 mA current loop input
None of these
are used with standard continuous control loop
are of the time proportioning type
(b) and (c) above

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Automation System
Resolution in a CRT refers to:

the number of phosphor dots that react when hit by the electron beam
None of these
the number of pixels in each square centimeter
the number of addressable elements on the tube
the speed at which the monitor can accept data from the computer

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Automation System
Light sensors:

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

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Automation System
Pressure sensors:

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

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