Why do many building codes restrict the use of unvented gas-fired space heaters?
A) They heat unevenly.
B) They tend to be less efficient than vented space heaters.
C) It is difficult to connect ductwork to them.
D) They release all their combustion products into the space they are heating.
[Ques. 2] Adding a little extra refrigerant over the amount recommended by the manufacturer:
A) Reduces system capacity but slightly increases system efficiency.
B) Reduces both system capacity and efficiency.
C) Increases system capacity slightly but reduces system efficiency.
D) Does not affect system capacity or efficiency, but provides a buffer against future refrigerant loss and nuisance call backs.
[Ques. 3] Which areas of a large office building have the most constant cooling load?
A) The south-facing exterior parts of the building
B) The interior parts of the building
C) The east- and west-facing exterior parts of the building
D) The north-facing exterior parts of the building
[Ques. 4] Why should an air vent never be put on a closed-type expansion tank?
A) The large amount of air in the expansion tank would overload the air vent.
B) The expansion tank is usually not located in a serviceable location.
C) Closed-type expansion tanks are normally installed at a low point in the system.
D) A closed expansion tank requires an air head to work properly.
[Ques. 5] How can the water flow through a geothermal system be determined?
A) By using an clamp-on water flow meter
B) By measuring the pressure drop across the coaxial coil and comparing it to the manufacturer's chart
C) By comparing the waterflow to the refrigerant pressure chart
D) By reading the display on the heat pump touchscreen control
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