The general types of commercial control systems include:
A) DC millivoltage, DC microamp loop, and AC frequency modulation.
B) Self-contained and remote.
C) Electric, electronic, and pneumatic.
D) Low-voltage, line voltage, and millivoltage.
[Ques. 2] Which of the following statements is TRUE about a Grade 1 fuel oil?
A) The oil consists of 1 percent sulfur. B) The oil consists of 1 percent carbon.
C) The oil consists of 100 percent light distillates. D) The oil consists of 100 percent residuals.
[Ques. 3] Total pressure readings are taken on a duct system by:
A) Subtracting the velocity pressure reading from the static pressure reading.
B) Pointing the pressure-sensing tube perpendicular to the air stream.
C) Pointing the pressure-sensing tube into the airstream.
D) Adding the static pressure reading and the total pressure reading.
[Ques. 4] What is the odorant commonly used in natural gas?
A) Natural gas has its own odor and does not need an odorant added.
B) Sulfur dioxide
C) Mercaptan
D) Propane
[Ques. 5] Before starting a new unit, the technician should:
A) Ohm out all electrical components.
B) Perform both a mechanical and electrical precheck.
C) Check the unit amp draw.
D) Check the system superheat.
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