You need a device to sense boxes passing on a conveyor, a sensing distance of 5 feet, that will have all sensor units that require power on one side of conveyor. What is the best sensor to use?
A) Diffuse photoelectric
B) Transmitted beam photoelectric
C) Retroreflective photoelectric
D) Capacitive proximity
E) None of the above
C
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Which water treatment method uses a pump to supply a desired chemical to the water at a rate proportional to the system flow?
a. neutralizing tank b. chemical feeder c. ozone injection d. diatomaceous earth filter
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45.5cm to inches
What will be an ideal response?
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Which type of piston is closely associated with older Detroit Diesel engines?
A. articulating B. crosshead C. M type D. flat crown
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The mechanical device used to change the state of a switch is called the pole
Indicate whether the statement is true or false
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