Two factors that influence the selection of a water heater are:
a. color of tank and type of fuel available
b. type of fuel available and energy costs associated with fuel
c. energy costs associated with fuel and time to install
d. time to install and type of fuel available
ANSWER: b
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When a gas furnace ignites and is under "full-fire," why does the fan not come on immediately?
What will be an ideal response?
What should the net stack temperature be on a category I gas furnace?
A) 150°F to 325°F B) 350°F to 475°F C) 200°F and higher D) 500°F to 675°F
A difference between a straight heat-cool thermostat and a heat pump thermostat is that:
A) Y and W swap functions. B) Heat pump thermostats do not energize the fan in the heating cycle. C) Y is energized in both heating and cooling. D) Y is energized in heating instead of cooling.
The third-angle projection symbol shows two symbols (views) of a truncated cone. The view on the right shows the cone with the larger base (longer line representing larger circle) on the left.
Answer the following statement true (T) or false (F)