How many grains are in a pound?
A) 144 B) 7,000 C) 12 D) 16
B
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Conduit systems in volatile envirnoments must be _____.
a. sealed b. bent c. left uncovered d. galvanized
Horsepower ratings must be converted to ____ before they can be added to the load calculation form.
A. kilo-volts (kV) B. kilo-watts (kW) C. volt-amperes (VA) D. kilo-amperes (kA)
Direct-expansion coils operating below the dew point of the entering airstream will:
A) Cool the water vapor (humidity) in the air and condense it as droplets on the coil. B) Expand the water vapor (humidity) in the air and condense it as droplets on the coil. C) Warm the water vapor (humidity) in the air and condense it as droplets on the coil. D) Cool the water vapor (humidity) in the air and expand it as droplets on the coil.
Which of the following accurately describes the danger of air in the refrigeration system?
A) Oxygen will chemically react with the refrigeration oil and deposits buildup in the discharge valve area, causing compressor motor burnouts. B) Oxygen may violently react with hydrogen and potentially cause a fire within the refrigeration system. C) Too much air makes it impossible to properly calibrate an analog vacuum gauge within the refrigeration system. D) The presence of air makes it impossible to connect a vacuum pump, which is necessary to perform the evacuation procedure.