What visual clues on a system can indicate the presence of a refrigerant leak?
A) A greenish stain around the area of the leak
B) Refrigerant bubbles forming around the leak
C) A visible cloud of refrigerant in the area of the leak
D) Oil stains around the area of the leak
D
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Los conductos suelen aislarse para _____.
a. conservación de la energía b. proteger el metal c. controlar la condensación d. La a y la c son correctas.
Which of the following is the most critical for proper walk-in installation?
a. The condensing unit is close to the walk-in for efficient operation. b. The floor panels are level before the wall and door panels are attached. c. The wall panels are insulated with urethane to prevent heat migration.
Convert 55 psig to absolute pressure
A) 55 psig + 15 = 70 psia (rounded) B) 55 psig + 30 = 85 psia (rounded) C) 55 psig - 15 = 40 psia (rounded) D) 55 psig - 30 = 25 psia (rounded)
What types of prime movers can be used for centrifugal chillers?
A) Steam turbines, natural convection, and radiation B) AC motors, calibrated springs, and wind C) Radiation, natural convection, and wind D) Gas turbines, AC motors, and steam turbines