_____ is the most common nutritional health problem.
Fill in the blank(s) with the appropriate word(s).
Anemia
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When brazing on a refrigeration line with an attached service valve:
A) The joint should be heated slowly to prevent overheating the valve. B) The line should be attached with quick-setting cement instead of brazed. C) The joint should be heated quickly to avoid overheating the valve. D) The valve should be cut out of the system prior to brazing to avoid overheating.
R-134a and R-1234yf are compatible with each other.
Answer the following statement true (T) or false (F)
Which of these statements about the hazard vehicle fire is true?
a. Under inflated tires cannot cause a vehicle fire. b. Poor cargo ventilation may cause cargo to catch on fire. c. Carrying a fully charged fire extinguisher may prevent a fire.
Which of the following statements are true regarding DX systems? Select all that apply.
A) They always have the compressor(s) in the fan coil unit. B) They include rooftop units and PTAC units. C) They generally use water-cooled condensers. D) They can have condensers remote from the fan coil unit.