How can a low pressure switch be used as an operating control for a refrigeration case?
A) Because the evaporator pressure goes up and down with the case temperature
B) Because commercial refrigeration does n not require close temperature control
C) Because the pressure inside the freezer cabinet drops as it gets colder
D) Because it is not possible to control commercial refrigeration with a thermostat
A
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a. área de alta presión b. horno c. conducto de salida d. economizador
Which of the following terms means displacement of soil particles from their original position?
a. Pollution b. Sedimentation c. Erosion d. Turbidity
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Indicate whether the statement is true or false
Why should oxygen tank valves be fully opened when in use?
A. To provide sufficient oxygen pressure. B. To prevent inadvertently increasing oxygen after a flame is set. C. It will prolong the service life of the valves. D. Oxygen will leak past valve threads on a partially opened valve.