When installing units requiring three-phase power, the voltages between any two power leads must be:
A) Within 10 percent of each other. B) Within 3 percent of each other.
C) Exactly the same. D) Within 15 percent of each other.
[Ques. 2] How does a power burner differ from an atmospheric burner?
A) A power burner uses air forced into the combustion area by a fan.
B) Power burners are primarily for residential use.
C) An atmospheric burner has a fan used to force air into combustion.
D) Atmospheric burners are rarely used today.
[Ques. 3] Open display cases are designed:
A) To pull down warm products to refrigerated temperatures.
B) To freeze liquid products in less than an hour.
C) To display products that do not need refrigerating.
D) To keep product at the same temperature at which it enters the case.
[Ques. 4] What is the purpose of the heat exchanger?
A) To separate the combustion gas from the circulating air while transferring heat from the circulating air to the combustion gas
B) To exchange the combustion gas for the circulating air in order to transfer heat into the house
C) To mix the combustion gas and the circulating air to transfer heat from the combustion gas to the house
D) To separate the combustion gas from the circulating air while transferring heat from the combustion gas to the circulating air
[Ques. 5] Codes relating to rooftop installation include:
A) OSHA, DOE, and EPA.
B) NIST, UL, and CSA.
C) Uniform Mechanical code, International Mechanical code, and National Fuel Gas code.
D) International Conditioned Air Code, Rooftop Installation National Code, and International Heating & Cooling Code.
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