How is the equivalent length of a duct determined?
A) Add the trunk duct length to takeoff and the branch duct length.
B) Add the equivalent lengths of all fittings from blower to register.
C) Add the trunk duct length to takeoff with the branch duct length and subtract the equivalent lengths of all fittings used from blower to register.
D) Add the trunk duct length to takeoff, the branch duct length, and equivalent lengths of all fittings used from blower to register.
[Ques. 2] The voltage drop in the power wire is checked by:
A) Reading the voltage before the unit starts and comparing it to the nameplate voltage.
B) Comparing the supplied voltage with the unit off to the voltage with the unit operating.
C) Reading the voltage after the unit starts and comparing it to the nameplate voltage.
D) Comparing the minimum and maximum allowable operating voltages on the unit data plate.
[Ques. 3] What materials are most commonly used for hydronic piping?
A) PVC and CPVC B) Copper and cross-linked polyethylene
C) CPVC and polybutylene D) Copper and galvanized iron
[Ques. 4] The temperature of the ground stays nearly constant at any depth below:
A) 4 feet. B) 28 feet.
C) 6 feet. D) The frost line.
[Ques. 5] How does excess air affect the vent gas CO2 percentage?
A) Excess air has no effect on vent gas CO2 percentage.
B) Excess air completely eliminates CO2 in the vent gas.
C) Excess air increases the vent gas CO2 percentage.
D) Excess air reduces the vent gas CO2 percentage.
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