The majority of problems with residential air-conditioning systems are due to:
A) Mechanical problems. B) Customer problems.
C) Electrical problems. D) Refrigeration problems.
[Ques. 2] The main advantage of measuring airflow using the temperature rise method is that temperature rise measurements:
A) Can be taken easily using a common thermometer.
B) Require no calculation.
C) Work well in both the heating and cooling cycles.
D) Are more accurate than measurements taken with a flow hood.
[Ques. 3] What is the purpose of the zinc rod used in steel boilers?
A) It prevents corrosion by reacting with corrosive elements before they attack the boiler.
B) It acts as a flame safety device.
C) It cycles the burner by sensing the water temperature.
D) It acts as an electrical ground for safety purposes.
[Ques. 4] After leaving the unit, condensate drain lines should be run:
A) With a maximum rise of 1/8 inch per foot.
B) With a minimum fall of at least 1/8 inch per foot.
C) To the nearest plumbing waste vent.
D) Level for a neat appearance.
[Ques. 5] What is a potential problem for the electrodes?
A) Clogged output terminals B) Lack of spark
C) Narrow nozzle orifice D) Cracked porcelain insulator
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