Why are liquid-line filter driers required for all systems using HFC refrigerant?
A) Because the filter drier also serves as a reservoir for refrigerant.
B) Because HFC refrigerants often form fluoride crystals inside the system.
C) Because the POE oil used with HFC refrigerant is very hygroscopic.
D) Because the filter drier is also the metering device in newer systems.
C
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The most common service factor appearing on a motor's nameplate is _____.
a. 1.15 b. 1.5 c. 2 d. 2.15
Which of the following improper operation is least likely cause exposure to toxic fumes?
A) Flare pilot or burner not lit B) Failure to line up purge gas to flare stack C) Refrigerant leak D) Loss of lubrication on equipment
El voltaje de prueba más común de megaóhmetros es de:
a. 25 VCD. b. 60 VCA. c. 500 VCD. d. 10.000 VCA.
A major roadway with a speed limit of 45 mi/h has an intersection that has no intersection control with a minor roadway at a right angle. A building is located next to the intersection at a distance of 60 ft from the center of the near lane on the major roadway and 40 ft from the center of the near lane on the minor roadway. At what speed for the minor roadway is the intersection safe? Grades are approximately level.
What will be an ideal response?