Which of the following is an actuator?
A. A motor
B. A relay
C. A solenoid
D. All of the above
Answer: D
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Electrical shock occurs when a person becomes part of an electrical circuit.
Answer the following statement true (T) or false (F)
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If properly composted, the internal temperature of the manure should reach which temperature?
a. 75°F to 100°F c. 140°F to 210°F b. 100°F to 200°F d. 240°F to 300°F
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Which switching device uses a shutter blade and sensor to detect a magnetic field?
A) Pickup coil
B) Hall-effect switch
C) Optical sensor
D) Ignition coil
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The best method of striking an arc when using a transformer-type DC welding machine is the _____
a. scratching method b. grounding method c. weaving method d. tapping method
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