Deck 2: Service and Repair: Water and Fuel Gas Distribution

Question 1

What part activates the burner in tankless water heaters?

A)heat exchanger
B)modulating gas valve
C)flow meter
D)draft blower

Answer 1

C

Question 2

Which type of soil would require the most angled slope when trenching to ensure excavation safety?

A)solid rock
B)granular soil
C)firm clay
D)running soil

Answer 2

D

Question 3

Safety requirements generally specify that all trenches of at least what distance should be cut back to the proper angle?

A)2 feet or deeper
B)3 feet or deeper
C)5 feet or deeper
D)18 inches or deeper

Answer 3

C

Question 4

What is the purpose of an anode rod?

A)protects steel water heater tanks from corrosion
B)helps heat water more quickly
C)monitors water tank level
D)removes overheated water

Question 5

What is the national phone number to call to connect with your local or regional utility-locator service to mark utility location prior to excavation?

A)611
B)811
C)911
D)711

Question 6

Which of the following is NOT a common misconception about tankless water heaters?

A)they supply an endless quantity of hot water
B)they typically have a factory maximum setting of 120 degrees, Fahrenheit
C)hot water is produced at the water fixture instantly
D)they will always lower your energy bills

Question 7

Water heater anode rods are usually made of either iron or copper.

Question 8

Water hammer typically occurs due to too little pressure in the water line.

Question 9

What might be an indication that the dip tube had become deteriorated?

A)water hotter than desired
B)reduced water flow
C)inconsistent water flow
D)reduced supply of hot water

Question 10

Which of the following is a long thin tube used on water heaters where both the hot and cold water ports are located on the top of the tank?

A)dip tube
B)anode rod
C)draft hood
D)screen-base flame arrestor

Question 11

Which of the following is NOT a cause of a water heater relief valve discharging large amounts of water?

A)sediment on relief valve disk
B)excessive water pressure
C)incorrect thermostat operation
D)overheated water

Question 12

What is usually the most common water heater problem?

A)plugged drain faucet
B)failed anode rod
C)faulty dip tube
D)leaky tank

Question 13

Most electric residential water heaters feature how many heating elements?

A)one
B)two
C)three
D)four

Question 14

Soil is generally very heavy, with one cubic foot weighing about 100 pounds.

Question 15

Water heater T&P valves must be set to open at?

A)180 ° F
B)210° F
C)220° F
D)170 ° F