What do technicians call the temperature at which water vapor begins to condense out of the air?
A) Specific humidity B) Enthalpy point
C) Dew point D) Wet-bulb temperature
[Ques. 2] What size should the combustion air ducts be for a room with a 60,000 BTU/hr input furnace and a 16,000 BTU/hr water heater if the air is traveling through horizontal ducts?
A) The size is irrelevant so long as there are combustion air vents.
B) 76,000/1,000 = 76 sq in free area each
C) 76,000/2,000 = 38 sq in free area each
D) 76,000/4,000 = 19 sq in free area each
[Ques. 3] When the temperature of the rejected condenser air is much warmer than usual, it can be an indication that:
A) The compressor is dirty. B) The condenser coil is dirty.
C) The evaporator coil is dirty. D) The filter is dirty.
[Ques. 4] When applied to buildings, the term sustainability means that the building must be designed and built in ways that:
A) Use no natural resources.
B) Allow all parts of the building can be accessed for maintenance.
C) Can continue indefinitely into the future without damaging or depleting natural resources.
D) Can continue for at least 10 years before it needs maintenance.
[Ques. 5] The correct way to discharge a capacitor is:
A) To connect 240 V AC to the terminals.
B) To short across the terminals with a screwdriver.
C) To touch both ends of a 20 k, 5 W resistor across the terminals.
D) To touch both ends of an 18 gauge wire across the terminals.
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