What size should the combustion air openings be for a room with an 80,000 BTU/hr input furnace and a 35,000 BTU/hr water heater if the openings are opening directly into a ventilated attic and a ventilated crawlspace?
A) The size is irrelevant so long as there are combustion air vents.
B) 115,000/1,000 = 115 sq in free area each
C) 115,000/2,000 = 57.5 sq in free area each
D) 115,000/4,000 = 28.75 sq in free area each
[Ques. 2] What type of fan is used in most air-cooled condensing units?
A) A draw-through propeller fan
B) A blow-through centrifugal fan
C) A draw-through centrifugal fan
D) No fanmost condensing units are natural draft.
[Ques. 3] According to the U.S. Green Building Council (USGBC), buildings in the United States are responsible for ________ percent of CO2 emissions, 40 percent of the total energy consumption, and 13 percent of all water consumption.
A) 39 B) 38 C) 30 D) 40
[Ques. 4] After a capacitor is discharged:
A) It may be reused if it is first charged with a capacitor charger.
B) It is no longer useful and must be replaced.
C) It is safe to handle.
D) It may be exchanged for a charged capacitor for a nominal fee.
[Ques. 5] When a VAV box on a constant-air-volume system throttles air into the conditioned area:
A) The compressor and blower both slow down to match.
B) The blower slows down to reduce overall airflow.
C) The compressor slows down to match it.
D) The excess air dumps into the area above the ceiling.
Quick Reply
