How can a hot water boiler heat water to 250F and not boil the water?
A) The system is under enough pressure to raise the boiling point above the water temperature in the boiler
B) The water does boil, but the steam is vented to the air
C) Hot water boilers cannot maintain 250F water without boiling the water
D) Water treatment is added whose primary purpose is to raise the boiling point of the water
Q. 2What two readings are needed to calculate the condenser air temperature difference?
A) Air temperature into and water temperature out of the condenser
B) Air temperature into and out of the condenser
C) Water temperature into and air temperature out of the condenser
D) Water temperature into and out of the condenser
Q. 3Medium and large commercial buildings typically use
A) low-pressure steam boilers. B) low-pressure hot-water boilers.
C) medium- or high-pressure steam boilers. D) medium- or high-pressure hot-water boilers.
Q. 4What kind of chart is required when calculating the liquid-line subcooling?
A) Pressure-temperature chart B) Refrigerant pressure chart
C) Atmospheric pressure chart D) Temperature difference chart
Q. 5What is the purpose of the zinc rod used in steel boilers?
A) It acts as a flame safety device
B) It prevents corrosion by reacting with corrosive elements before they attack the boiler
C) It acts as an electrical ground for safety purposes
D) It cycles the burner by sensing the water temperature
Q. 6Which kind of cooling tower draws or pushes the air across the water, rather than up through it?
A) crossflow B) counterflow C) forced-draft D) induced-draft
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