How many mini-split heat pump systems would a house with four main rooms typically use?
A) One mini-split system installed in a central location
B) One mini-split system connected to ductwork to distribute the air
C) Mini-split systems cannot be used to condition buildings with more than one room.
D) One mini-split system in each room
[Ques. 2] What is the common operating voltage range on the cells of electronic air cleaners?
A) 6,000 to 10,000 volts DC B) 120 to 240 volts AC
C) 25,000 to 50,000 volts DC D) 480 to 600 volts DC
[Ques. 3] What is the last step in the operational sequence of the typical oil-fired furnace?
A) The flame shuts down. B) The indoor blower turns off.
C) The heat exchanger cools. D) The fan switch contacts open.
[Ques. 4] How is the R value determined for a composite structure, such as a wall?
A) The R value of the component with the highest R value is used.
B) The R value of the component with the lowest R value is used.
C) The R values of all the individual components are added together and averaged.
D) The R values of all the individual components are added together.
[Ques. 5] To avoid system breakdown due to the failure of components that have a predictable service life, it is wise to:
A) Always use pulleys that have two belts.
B) Not purchase any equipment that has parts that can wear out.
C) Schedule parts replacements for wear items near the end of their service life.
D) Install another backup system that can be quickly brought online.
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