In an office where people sit quietly at desks from 8:30 a.m. to 5:00 p.m., which type of lighting control would be most efficient in turning off the lights when they were not needed?
a. Ultrasonic occupancy detector
b. Infrared occupancy detector
c. Timer
d. Passive infrared sensor
c. Timer
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A. straight course B. uniform distribution C. plumb bond D. alternating bond
What is the percent saturation of water at sea level and 25ºC containing 9.8 mg/L of dissolved oxygen? Would you expect the dissolved oxygen level to increase or decrease, if the system were to move towards equilibrium?
What will be an ideal response?
Creating electricity by exerting force on a crystal is called _________
A) Photoelectricity B) Electrochemistry C) Thermoelectricity D) Piezoelectricity
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A) 1/2 crankshaft speed B) Twice crankshaft speed C) Crankshaft speed D) 1/4 crankshaft speed