Plumbing Inspection Section#2 Water Heaters Test#2

• Question 1

  1 out of 1 points

  	The ignition transformer
  	Selected Answer:   converts household current to high voltage Answers: produces a low voltage spark to light the atomized oil/air mix can be reset by turning the feed switch off and then on again   converts household current to high voltage should never be touched when the burner is operating (high temp) can be fouled by dirty oil

• Question 2

  1 out of 1 points

  	Which of the following statements about discharge tubes for temperature/pressure relief valves on water heaters is TRUE?
  	Selected Answer:   the tube diameter has to be as large as the relief valve discharge opening Answers: the tubes cannot be plastic on newer (since 2007) heaters, tubes must have a shutoff valve if there is no shutoff valve, the end should be threaded for a cap   the tube diameter has to be as large as the relief valve discharge opening the end of the tube should be within 24 inches of the top of the tank

• Question 3

  1 out of 1 points

  	One reason for lack of combustion air for a water heater could be that the
  	Selected Answer:   house is under negative pressure Answers: house is too leaky (not airtight) water heater is not tuned correctly fireplace damper is open (no fire burning) burner cover is on   house is under negative pressure

• Question 4

  1 out of 1 points

  	Each elbow on an oil fired water heater exhaust flue is roughly equivalent to how many feet of straight exhaust piping?
  	Selected Answer:   10 Answers: 4 6 8   10 12

• Question 5

  1 out of 1 points

  	If a gas-fired water heater is inoperative, it is safe to assume
  	Selected Answer:   there is no hot water Answers:   there is no hot water the pilot light is out the gas valve is shut off or defective the electricity for a power vented heater is off the gas supply to the unit is shut off

• Question 6

  1 out of 1 points

  	Hot water boilers are less likely to suffer corrosion than water heaters because
  	Selected Answer:   water heaters constantly see new water Answers: boilers use non-corrosive piping water heaters use a sacrificial anode boiler water temperatures are hotter at the inlet pipe water heaters have insulation; boilers don't   water heaters constantly see new water

• Question 7

  1 out of 1 points

  	How can sludge in a water heater affect the water in a house?
  	Selected Answer:   it can obstruct the dip tube and lower the water pressure Answers: sludge can turn the water milky it can lower the effective water temperature   it can obstruct the dip tube and lower the water pressure sludge has very little effect it is a prime source of deposits in kettles and rings in bath tubs

• Question 8

  1 out of 1 points

  	A water heater's water pressure at the hot outlet pipe compared to the pressure at its cold water inlet pipe is
  	Selected Answer:   virtually the same Answers: lower higher   virtually the same higher, and variable with the water temperature higher depending on the altitude

• Question 9

  1 out of 1 points

  	If copper tubing has been used for gas piping
  	Selected Answer:   it should be identified as such every 5 or 6 feet Answers: it should be noted as a concern the runs should be no longer than 24 feet   it should be identified as such every 5 or 6 feet it should not be run adjacent to a copper water line only Teflon tape should be visible at the joints

• Question 10

  1 out of 1 points

  	Using the current convention for measuring recovery rates, water entering a tank at 50°F would be at what temperature when it leaves?
  	Selected Answer:   140°F Answers: 120°F   140°F 160°F 180°F 190°F

• Question 11

  1 out of 1 points

  	Water heaters in garages should be raised off the floor primarily
  	Selected Answer:   to reduce the risk of gas vapors igniting Answers: to protect them from cars or other mechanical damage so they can be accessible and serviced more easily to keep pets, animals or pests from gaining access   to reduce the risk of gas vapors igniting to stop any flooding from extinguishing the pilot light

• Question 12

  1 out of 1 points

  	Sacrificial anodes are typically made of
  	Selected Answer:   magnesium Answers:   magnesium titanium copper manganese a composition of various alloys

• Question 13

  1 out of 1 points

  	The minimum estimated life expectancy of a water heater in North America is
  	Selected Answer:   8 to 12 years Answers: 4 to 8 years 6 to 10 years   8 to 12 years 10 to 12 years 12 to 14 years

• Question 14

  1 out of 1 points

  	The primary controller on an oil-fired water heater
  	Selected Answer:   checks the exhaust flue to make sure the burner fired Answers: is responsible for the correct oil/air mixture cannot be reset by a homeowner has been replaced on modern equipment by a glow plug (or similar device)   checks the exhaust flue to make sure the burner fired will not function if there is a blockage in the chimney

• Question 15

  1 out of 1 points

  	All of the following will be found on a hot water boiler EXCEPT
  	Selected Answer:   sacrificial anode Answers: hot water outlet electric wiring tank for the water pressure relief valve   sacrificial anode

• Question 16

  1 out of 1 points

  	The element that causes the greatest corrosion to water heaters is
  	Selected Answer:   oxygen Answers: hydrogen   oxygen sulfur acid rust

• Question 17

  1 out of 1 points

  	While the water temperature on a water heater can be set higher, the commonly recommended setting is
  	Selected Answer:   120°F Answers:   120°F 130°F 140°F 150°F 180°F

• Question 18

  1 out of 1 points

  	The best method to check for a vent connector extending too far into a masonry chimney is to
  	Selected Answer:   look in the chimney cleanout with a mirror Answers: pull the connector out and measure the length look for the appropriate label on the vent connector note any tell-tale scorching where the connector enters the chimney watch for backdrafting when the appliance first starts up   look in the chimney cleanout with a mirror

• Question 19

  1 out of 1 points

  	Drip legs should
  	Selected Answer:   be found on the first appliance in from the meter Answers:   be found on the first appliance in from the meter be checked and cleaned on an annual basis have a clear window for ease of monitoring not be installed vertically in order to be effective have a soldered cap or be locked by other means

• Question 20

  1 out of 1 points

  	Which water heater has the slowest recovery rate?
  	Selected Answer:   a single-element electric heater Answers:   a single-element electric heater a double-element electric heater an oil-fired water heater a conventional gas-fired water heater a direct-vent gas-fired water heater

• Question 21

  1 out of 1 points

  	Which of the following statements is true with respect to electric water heaters?
  	Selected Answer:   the lower element usually comes on first Answers: the upper element thermostat is set higher than the lower element thermostat   the lower element usually comes on first the lower element has priority the upper element does more work it is easy to tell visually if one of the two elements is burned out

• Question 22

  1 out of 1 points

  	If there is a small gas leak
  	Selected Answer:   they are often not detected Answers: it is usually detectable without specialized equipment gas appliances in the house may not work properly   they are often not detected the gas meter won't likely reflect it homeowners should be told to ignore it

• Question 23

  1 out of 1 points

  	The required clearance from combustibles for a double-wall vent connector (B vent)on a gas water heater is
  	Selected Answer:   1 inch Answers:   1 inch 2 inches 4 inches 6 inches 9 inches

• Question 24

  1 out of 1 points

  	The purpose of a vacuum relief valve on a water heater is to
  	Selected Answer:   prevent a cross connection Answers: let off any excessive pressure release any built-up heat   prevent a cross connection allow easier replacement of the water heater facilitate draining the tank

• Question 25

  1 out of 1 points

  	All of the following would be found on both gas and electric water heaters EXCEPT
  	Selected Answer:   vent Answers: sacrificial anode rod dip tube cold water inlet   vent drain valve