How can a Hall generator be used in a manner similar to a limit switch?
What will be an ideal response?
If the sensor is mounted beside a piece of moving equipment, and a permanent magnet is attached to the moving equipment, a voltage will be produced when the magnet moves near the sensor.
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Hydrated lime-water paste sets and hardens due to the
A) chemical reaction of nitrogen in air with lime. B) chemical reaction of oxygen in air with lime. C) chemical reaction of water with lime. D) chemical reaction of water in lime with carbon dioxide in air. E) chemical reaction of carbon dioxide in air with lime.
An issue of great concern for animal welfare activists is the use of animals for
What will be an ideal response?
The annual bluegrass problem is greatest on:
A) lawns B) golf courses C) sports fields D) roadsides
All of the following are benefits of organic soil amendments EXCEPT that they ____
a. contain large amounts of organic matter that improve the physical condition of the soil b. support growth of beneficial soil organisms c. use otherwise harmful industrial by-products d. produce greater yields than an equivalent fertilizer