What is the minimum desired return water temperature for a gas-fired boiler?
A) At least 100F returning to the boiler B) At least 140F returning to the boiler
C) At least 80F returning to the boiler D) At least 180F returning to the boiler
[Ques. 2] How is the condensate from the evaporator disposed of in a basement installation?
A) Condensate does not form on the coil when it is installed in a cool location.
B) By using a condensate pump
C) The air pressure in the system pushes the condensate up no more than 3 feet above the drain pan.
D) The condensate drain can be plugged to prevent water from leaving, eliminating the need for a drain.
[Ques. 3] What is indicated by a frothy stream of oil in the oil supply line?
A) Water in the oil tank B) Too little antisurfactant additive in the oil
C) Too much antisurfactant additive in the oil D) A leak in the suction line
[Ques. 4] The volume of air flowing out a supply register can be directly measured with a(n):
A) Anemometer. B) Velometer. C) Flow hood. D) Tachometer.
[Ques. 5] The burner motor runs, but the oil pump does not produce pressure. This can be caused by:
A) A defective burner motor centrifugal switch. B) A plugged oil nozzle.
C) A defective ignition transformer. D) A defective oil pump drive coupling.
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