The application of electric space heaters is generally more flexible than space heaters that rely on combustion because:
A) They can be located anywhere in the room with a long extension cord.
B) They do not require any combustion air and do not require venting.
C) They can be operated on batteries.
D) No clearance to combustible materials is required; they have no flames.
[Ques. 2] Glycol solutions are added to water in secondary refrigerant loops:
A) To lubricate the circulating pump bearings. B) To increase the system heat transfer.
C) To make leaks easier to locate. D) To prevent freezing and inhibit corrosion.
[Ques. 3] Which manufacturer-supplied reference uses pass/fail tests to guide the technician to the possible cause of system malfunction?
A) The logic flowchart B) The benchmark data
C) The symptoms list D) The fault code reference list
[Ques. 4] What is the lowest temperature a cooling tower can produce?
A) A few degrees above the incoming air wet-bulb temperature
B) 32F, the temperature where water freezes
C) A few degrees above the incoming air temperature
D) Down to a few degrees above absolute zero if applied correctly
[Ques. 5] Why must you cover the coils when testing the heat pump in warm weather?
A) To prevent the heat pump from overloading the compressor
B) To increase the amount of heat delivered to the system
C) To reduce the amount of heat lost from the system
D) To trigger the temperature valve to release excess pressure
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