During a planned maintenance call, technicians should check the power wiring to make sure:
A) The unit is not grounded.
B) Any resilient mounted motors are isolated from ground.
C) The unit is grounded.
D) A heavy wire runs from both L1 and L2 to the equipment ground.
[Ques. 2] The different types of terminal units used for hot water heating systems include:
A) Baseboard heaters, convectors, fan coil units, and radiators.
B) One-pipe and two-pipe terminal units.
C) Heating only, cooling only, and combination heating-cooling units.
D) Series loop, parallel loop, and reverse return loop.
[Ques. 3] Water and refrigerant flow through the coaxial coil:
A) Together and are separated at the end by a separator tube.
B) In the same direction.
C) In opposite directions.
D) At different times depending on the cycle.
[Ques. 4] What is the purpose of excess combustion air?
A) Excess air improves the over-fire draft.
B) Excess air is added to increase the combustion temperature.
C) Excess air is added to improve combustion efficiency.
D) Excess air is added to ensure complete combustion.
[Ques. 5] Which class of manufactured duct has the lowest flame spread and smoke developed ratings?
A) Ductwork does not burn. B) Class 0
C) Class 1 D) Class 2
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