Author Question: Most communicating systems are wired with four wires. They are: A) Two wires for 24 V power and ... (Read 168 times)

azncindy619 · **on:** Jul 24, 2018

Most communicating systems are wired with four wires. They are:

A) Two wires for 24 V power and two for communication.
B) Communication lines 1, 2, 3, and 4.
C) One wire for power, one for cooling, one for heating, and one for fan.
D) Power lines 1, 2, 3, and 4.

Question 2

How can negative room pressure create a hazardous situation in a house with combustion appliances?

A) All the heat can be sucked out of the room through the vent.
B) Combustion products can spill into the house.
C) The appliances may burn excessively hot.
D) The gas pressure may be affected.