What kind of expansion tank must be installed above the highest terminal unit?
A) Diaphragm type B) Closed type
C) Pressure-relief type D) Open type
[Ques. 2] What two manual resets do all oil burners have?
A) The integrated furnace circuit breaker and the high fuel pressure reset
B) The primary control reset and the secondary control reset
C) The primary control reset and the oil burner motor overload manual reset
D) The high limit manual reset and the smoke sensor manual reset
[Ques. 3] Semihermetic compressors on large commercial AC units use ________ to stage the compressor by cutting out individual cylinders in response to load changes.
A) king valves B) TXV valves
C) automatic expansion valves D) unloaders
[Ques. 4] Isolating the break in a circuit by starting at a point where there is correct voltage, and moving one lead from point to point toward the nonfunctional load is called:
A) Running the rat. B) Hopscotching.
C) Quantitative analysis. D) Shotgunning.
[Ques. 5] In order to facilitate air removal, a diaphragm-type expansion tank should be placed:
A) Above the boiler, below the roofline. B) On the discharge side of the boiler.
C) Above the highest terminal unit. D) On the supply aide of the boiler.
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