What type of sensor is most often used to detect very low parts per million for toxic refrigerants?
A) Photoacoustic infrared (PIR) B) Nondispersive infrared (NDIR)
C) Electrochemical (EC) sensors D) Ceramic metal oxide semiconductor (CMOS)
C
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According to legend, who were the first people to use artificial insemination?
a. the Greeks c. the Chinese b. the Russians d. the Arabs
The hunger problem is best defined in terms of excess population growth and inequitable distribution of the food supply
Indicate whether the statement is true or false
In the preceding problem, the erroneous answer generated would be corrected by:
A) adding 0110 to the least significant code group. B) converting both BCD code groups to straight binary form and subtracting 0110 from the least significant code group. C) adding 0110 to both the most and least significant BCD code groups. D) adding 0110 to the most significant code group.
What two readings are needed to calculate the condenser air temperature difference?
A) Air temperature into and water temperature out of the condenser B) Water temperature into and air temperature out of the condenser C) Air temperature into and out of the condenser D) Refrigerant temperature into and out of the condenser