NHIE and AHIT Exam Questions and Answers

NHIE and AHIT Exam Questions and Answers This type of water heater ventilation system uses the natural upward movement of airflow to filter exhaust gases up and out of the home. - Answer-atmospheric ventilation system The shutoff valve for a gas water heater's supply line may not be more than _____ feet from the water heater. - Answer-6 Water heaters must be installed in a location that has a level working space that is at least _____ inches long and _____ inches wide. - Answer-30, 30 Water heaters that use a gas fuel source may not be located in a room with _____ machinery. - Answer-air-handling Chimney Cap - Answer-mounted above the crown, preventing water, birds, small animals, and debris from getting inside the chimney while allowing smoke and gas to escape. Chimney Crown - Answer-the top level of the chimney, with a sloped surface directing much of the water away from the chimney Spark arrestor - Answer-mesh covering that stops sparks and embers from leaving the chimney. Irrigation systems conserve water by the use ___ ____ or ___ ___ sensors (SMS). - Answer-rain sensors, soil moisture What 2 components are in a zone for a sprinkler system? - Answer-valve, sprinkler head What is a backflow preventor? - Answer-Stops water contaminated from pesticides, fertilizers, or other chemicals from entering the home's supply of drinking water by allowing water to flow only one way What are 2 possible locations for the irrigation system's shut-off valve? - Answer-below backflow preventor or underground, in line with water supply Four types of well pumps: - Answer-shallow well jet, centrifugal, deep well jet, deep well submersible Pressure switch - Answer-senses water pressure and turns the pump off and on and is normally mounted on piping at the water pressure tank. Two types of septic systems: - Answer-conventional, alternative In a conventional septic system, sludge and scum remain in the tank, and the liquid called ____ leaves the tank. - Answer-effluent A ___ ___ is a network of perforated pipes in trenches or beds of gravel. - Answer-drain field For ranges, vent hood ducts must (3): ___, ___, and ___. - Answer-terminate outside the home, have a smooth interior surface and be constructed of (galvanized steel, stainless steel, or copper), and be airtight What 3 things can prevent cross connections at some equipment and fixtures: - Answer-anti- siphon devices, vacuum breakers, air gaps S-traps can be converted to a vented P-trap through the use of an: - Answer-air admittance valve This type of meter was installed in the last 20 years. They're usually compatible with 200 amp service, although there are exceptions. - Answer-Rectangular-base meters UL stands for: - Answer-Underwriters Laboratory This type of meter was installed 50 or more years ago. They were originally rated for 60 amps. Later generations of round-base meters were rated at 100 amps. - Answer-Round-base meters This type of meter was installed 40 or more years ago. They were normally rated at 100 amps, with later generations someti