____ used in burglar alarm systems commonly use infrared LEDs as the light source.
a. Proximity sensors
b. Ultrasonic detectors
c. Proximity detectors
d. Photodetectors
d. Photodetectors
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For a three-pole circuit breaker, ____ pole(s) is (are) required for each breaker used.
A. one B. two C. three D. four
Sparks, which can easily be generated around a battery, can cause an explosion due to the battery’s possible release of _____.
a. electrolytes b. hydrogen gas c. methane gas d. baking soda
Soft PLC in the Allen Bradley system is PLC software that runs on a personal computer
Indicate whether the statement is true or false
When you are starting to move up a hill from a stop:
a. Keep the trailer brake hand valve applied until you reach 20 mph. b. Engage the clutch and accelerate quickly. c. Release the parking brakes as you apply engine power.