If an R-12 refrigeration system has its air-cooled condensing unit on a 100°F roof and the condenser outlet temperature (refrigerant) is 115°F, with how much subcooling is the condenser operating?
A. 30°F
B. 15°F
C. 100°F
D. 130°F
Answer: B
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A ____ is used to keep the bottom of the stringer from sliding on the floor when downward pressure is applied to the stringer.
A. riser B. stair jack C. kickblock D. stringer
Some hybrid air conditioning systems use an electrically driven compressor that uses a special lubricant. What precaution should be taken when servicing these systems?
A) A separate recycling machine for the HEV B) Extra refrigerant filters C) A special gauge set D) Low pressure pump
Hot water is circulated through a hot water heating system:
A) Using water circulating pumps. B) Using large diaphragm pumps. C) Using external-drive water compressors. D) Because of the density difference between hot and cold water.
Which file contains the status information associated with external I/O instruction?
A. program B. data