Competency B1

Self-Test 1

1. b. False
2. a. True
3. b. False
4. c. 125 psig
5. a. True
6. b. False
7. b. False
8. d. Any of the choices

Self-Test 2

1. b. Upstream of the automatic gas valve
2. b. False
3. c. CSA B149.3
4. c. 100% safe
5. b. False

Self-Test 3

1. b. Valve disc
2. c. Diaphragm
3. a. Spring
4. c. To maintain a constant gas pressure at the gas valve inlet
5. c. The outlet pressure under the diaphragm
6. d. The adjustable spring above the diaphragm
7. c. The adjusting screw is screwed down
8. c. Allow the regulator to breath
9. d. Opening force of the spring is equal to the closing force of the downstream pressure
10. c. Droop
11. b. The regulator will close completely
12. d. Keep downstream pressure closer to set point during flow conditions
13. a. Provide mechanical advantage for positive shut-off
14. b. It decreases
15. a. Service regulators
16. d. Regulator to respond slow or sluggish
17. a. The pressure downstream of a regulator under no flow conditions
18. c. 2 psig
19. a. Two stage regulation
20. c. First stage 5 psig, Second stage 2 psig
21. d. MBH
22. a. remain permanently open
23. d. to keep downstream pressure closer to set point during flow conditions.
24. b. Normally closed

Self-Test 4

1. c. Thermal expansion of solids
2. d. Thermal expansion of liquids
3. a. Electro-magnetism
4. c. Thermocouple
5. d. Gas water heater
6. c. To open or close the valve seat faster
7. a. True
8. c. Appliance regulator
9. b. ECO
10. d. A second automatic shutoff valve seat
11. c. Electric Stepper motor
12. a. True
13. b. False
14. b. False
15. b. Low Fire 1 – 1.5 in.WC, High Fire 3 – 4 in. WC.
16. c. The copper tube has contracted and the Invar rod has opened the gas valve.
17. a. the coil is energized
18. a. 30 MV
19. d. 24 MV
20. b. downstream of the safety valve
21. b. inlet gas pressure and spring pressure
22. b. the pressure to the main burner
23. a. Seismic valve
24. d. Redundant gas valve
25. a. remain fully open and never close
26. b. a thermocouple
27. b. False
28. c. Snaps open to a pre-set minimum input

Competency B2

Self-Test 1

1. b. False
2. a. True
3. a. True
4. c. Remove the handle and tighten the packing nut
5. b. False
6. b. False
7. b. Pulls onto the fitting

Self-Test 2

1. b. False
2. b. 2 psig
3. c. Lowest maximum pressure rating of any downstream components
4. b. False
5. a. True
6. b. False
7. a. True
8. d. All of the above
9. d. Use 1 inch pipe for the entire length – make the change at the vent tapping
10. a. the regulator to “hunt”
11. c. The vent must be piped to a safe location outdoors
12. a. A vent leak-limiting system
13. b. False
14. c. 10 ft
15. b. 3 ft

Competency B3

Self-Test 1

1. b. False
2. d. 50 psi for 180 minutes
3. b. False
4. b. False
5. a. To verify that the supply is closed tight
6. b. 22.28 ft³ (1789 L)

Self-Test 2

1. a. True
2. b. False
3. b. False
4. b. False
5. c. 2 psi
6. c. 1″ NPS
7. b. 100 ft

Competency B4

Self-Test 1

1. b. Exfiltration
2. a. True
3. b. 5 Pa (.02” wc)
4. b. Direct vent and room air systems
5. b. False

Self-Test 2

1. d. Manufacturer’s literature
2. c. 9 in.²
3. c. ½”
4. c. Loose building of sufficient volume
5. b. 10% or 10 in.²
6. d. 47 in.²
7. b. 9 in.²
8. d. 35000 mm²
9. b. 14 in.²
10. c. 32 in.²
11. None required
12. b. 260 in.² upper and lower
13. c. 201 in.²
14. b. 10 in.²
15. c. 310000 mm²
16. b. 67 in.²
17. d. 240 in.²
18. c. 12250 mm²

Self-Test 3

1. b. False
2. c. 24 in.
3. b. 12 in.
4. d. 36 in.
5. b. False
6. d. 50 ft
7. b. False
8. a. True
9. b. 12 in.