To prevent mineral buildup and scale on an ice machine:
A) Use an ultraviolet light. B) Test the pH of the incoming water.
C) Clean regularly with a chlorine disinfectant. D) Use a water filter to remove suspended solids.
[Ques. 2] The resistance reading of a good 5 kW heating element is:
A) A measurable resistance of approximately 50,000.
B) A measurable resistance of approximately 12.
C) Infinite ohms, which would show OL on most digital meters.
D) 0, which would show 0.0 to 0.1 on most digital meters.
[Ques. 3] A difference between a straight heat-cool thermostat and a heat pump thermostat is that:
A) Y and W swap functions.
B) Y is energized in both heating and cooling.
C) Y is energized in heating instead of cooling.
D) Heat pump thermostats do not energize the fan in the heating cycle.
[Ques. 4] If a modern home is built too tightly, the air change rate per hour is reduced. What should be done to increase ventilation to safe levels?
A) Open the ground floor windows.
B) Increase the blower fan speed.
C) Use a mechanical ventilation system to bring in fresh air.
D) Reduce the insulation in the home.
[Ques. 5] Why is it advantageous to maintain a positive pressure in a building?
A) To reduce drafts B) To reduce exfiltration
C) To minimize system ventilation heat load D) To simplify system fan and duct design
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