With the compressor off, a technician compares the pressure of an air-cooled condenser with the pressure given on the PT chart for that refrigerant and temperature. The system pressure is considerably higher than the pressure indicated on the PT chart for that refrigerant and temperature. This indicates that:
A) The system has noncondensable gases in it.
B) The system has been properly evacuated and charged.
C) The system has been slightly overcharged.
D) The system has been undercharged.
A
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_____ is not recommended anymore for flashing in cavity masonry walls.
A. Copper B. Stainless steel C. Plastic D. Aluminum
An average home in the United States consumed about 12,773 kWh of electricity in 2005. The national average carbon dioxide emission rate for electricity generated in 2007 was 1,293 lbs. of CO2 per megawatt-hour. Approximately 7% of the electricity generated is wasted due to losses in the transmission and distribution system.
a. How much CO2 was generated per year for an average U.S. home due to electricity use? b. How much CO2 was emitted from household use of electricity is there were 111.1 million homes in the United States in 2005? c. How much CO2 will be emitted from household use of electricity if there are 166 million homes in the United States in 2050? What will be an ideal response?
To join pipes of different sizes, pipefitters use reducers and _____.
a. couplings b. unions c. bushings d. wyes
Which terminal controls the reversing valve on most heat pumps?
A) W terminal B) O/B terminal C) G terminal D) Y terminal