What type of sensor is most often used to detect very low parts per million for toxic refrigerants?
A) Electrochemical (EC) sensors B) Ceramic metal oxide semiconductor (CMOS)
C) Photoacoustic infrared (PIR) D) Nondispersive infrared (NDIR)
A
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American Indian activists brought attention to their cause in the 1970s by seizing
A. the Little Bighorn battleground and Mount Rushmore in the sacred Black Hills. B. Alcatraz Island and Wounded Knee, South Dakota. C. the major tribal headquarters throughout Oklahoma. D. salmon fishing grounds in Washington and trout streams in Wisconsin and Minnesota. E. the Tippecanoe battlefield and Mesa Verde National Park.
The formula for inductive reactance is _____
a. XL = 1 ÷ 2?fL b. XL = 2 ÷ ?fL c. XL = 2? ÷ fL d. XL = 2?fL
The calorie is defined as the amount of heat required to raise the temperature of 1 gram of water by 1?C. Also, the energy content of food is typically expressed in Calories which is equal to 1000 calories. Convert the results of the previous problem to Calories (1 Btu = 252 calories)
What will be an ideal response?
Types of closed loops include
A) horizontal loops, vertical loops, and slinky loops B) horizontal loops, well systems, and slinky loops C) well systems, lake loops, and vertical loops D) well systems, slinky loops, and horizontal loops