Test 1

Question 1

What type of vacuum breaker is used where there is no back pressure downstream, but a valve is installed downstream of the vacuum breaker.
A. Atmospheric
B. Pressure
C. Hose
D. All could be used

Answer 1

B. Pressure

Page 42
Section 603.3.6

Question 2

A 2-inch Trap (arm) may be located____ from a vent?

A. 42”
B. 48”
C. 54”
D. 60

Answer 2

D. 60”

Section 1002.2
Page 85

Question 3

When a rough plumbing air test is done,the test procedure shall be____?
A. 5 psi for 15 min
B. 5 psi for the period required inspection
C. 1” of water column for the period of required inspection.
D. Either A or C may be used at the request of the inspector.

Answer 3

A. 5 psi for 15 minutes

Section 712.3

Page 72

Question 4

Distance between the trap and vent on a water closet with a 4” trap arm will not be more than____?
A. 4’
B.6’
C.8’
D.5’

Answer 4

B.6’

Section 1102.2 ft note

Page 85

Question 5

5. Application for a plumbing license is made to

A. State health department
B. Commissioner of health
C. MN Plumbing Department
D. Department of Labor and Industry

Answer 5

D. Department of Labor and Industry

417.16

Question 6

7. A test and inspection tag must be affixed to an RPZ after it’s been tested?
   A.True
   B. false

Answer 6

A. True

603.5.23.3
Pg 48

Question 7

8. What type of urinal is prohibited?
   A. Blowout
   B. Wall-hung pedestal
   C. Siphon jet
   D. Trough

Answer 7

D. Trough

405.2 pg 30

Question 8

9. The waste pipe for a commercial food disposal must not be less than ____?
   A. 1 1/2 “
   B. 2”
   C. 2 1/2”
   D. 3”

Answer 8

B. 2”

Table 702.1
Footnote 2 ph 65

Question 9

10. Any pipe making and angel of less than 45 degrees with the horizontal is called a vertical pipe.
    A. True
    B. False

Answer 9

B. False

224.0 pg 20

Question 10

11. Can a vent from a chemical waste tie into a waste from a bathroom?
    A. Yes
    B. No

Answer 10

B. No

811.6 ph 79

Question 11

12. What is the minimum size pipe for an underground drain?
    A. 1 1/2”
    B. 1 1/4”
    C. 2”
    D. 3”

Answer 11

B. 1 1/4”

703.2 pg 67

Question 12

13. Cleanouts for a 4” pipe shall be located ______ ft apart
    A. 50’
    B. 100’
    C. 150’
    D. 200’

Answer 12

B. 100’

707.4 pg 70

Question 13

14. Are saddle hubs permissible inside of the drainage system?
    A. Yes
    B. No

Answer 13

B. No

310.1 pg 23

Question 14

15. The rough plumbing shall be air tested at the uniform pressure of ____?
    A. 5 lbs for 10 min
    B. 5 lbs for 15 mins, or duration
    C. 10 lbs for 15 min
    D. 5 lbs for min

Answer 14

B. 5 lbs for 15 min or duration

712.3 pg 72

Question 15

16. A 6” clean out is needed on a 6” sewer line before reducing pipe size
    A. True
    B. False

Answer 15

B. False

Table 708.1 pg 70

Question 16

17. A water closet shall be installed so that____.
    A.the center line is no less than 15” from any side wall.
    B. The top of the seat is not over 2” above the rim of the fixture.
    C. At least 24” of clearance must be provided in front of water closets
    D. Both A and C may are correct.

Answer 16

D. Both A and C are correct.

Section 402.5

Page 29

Question 17

18. The minimum size building water service is ____?
    A. 1”
    B. 3/4
    C. 1 1/4”
    D. Whatever the city required

Answer 17

B. 3/4”

Table 610.7
Footnote of 58

Question 18

19. The maximum vertical distance from a fixture to the trap weir is ____?
    A. 10”
    B. 24 “
    C. 18“
    D. 20”

Answer 18

B. 24”

1001.1 pg 85

Question 19

20. Does a residential (R-3) dwelling boiler require an RPZ?
    A. Yes
    B. No

Answer 19

B. No

603.5.10 pg 47

Question 20

21. The finished plumbing shall be tested at a pressure equal to ___?
    A. 1” per static pressure
    B. 1 lb per square inch
    C. 5 lb
    D. 1” water column

Answer 20

D. 1” water column

712.5 pg 72

Question 21

22. Any licenses who does not renew within ____ is no longer eligible for renewal?
    A. 2 years
    B. 3 years
    C. 4 years
    D. 5 years

Answer 21

A. 2 years

4716.0040 pg 174

Question 22

23. A plumber must be licensed to work is cities with a population over ____?
    A. 500
    B. 10,000
    C. 1000
    D. 5000

Answer 22

D. 5000

326b.475 pg 199

Question 23

24. How high above the flood rim level of the fixture can an offset occur using a 90 degree elbow?
    A. 2”
    B. 4”
    C. 6”
    D. 2 times the diameter

Answer 23

C. 6”

905.3 pg 81

Question 24

25. Is it permissible to use a 1 1/2” combination T.Y. Fitting in the vertical pickup of a 3’ trap arm with a 1 1/2” trap?
    A. Yes
    B. No

Answer 24

B. No

905.2 pg 81

Question 25

26. The minimum length of a clothes washer standpipe is ____? A. 16” B. 24” C. 18” D. 30”

Answer 25

C. 18” 804.1 pg 78

Question 26

27. The vertical distance from the crown weir and top dip of the trap is ____? A. 3 to 5 inches B. 1 1/2 to 3 1/2 inches C. 2 to 4 inches D. Per mfg instructions

Answer 26

C. 2 to 4 inches 1005.1 pg 86

Question 27

28. New RPZ installations must be at least ____ but not more than ____ above the finished floor ground level. A. 12” to 6’ B. 12” to 5’ C. 18” to 7’ D. 12” to 5.6’

Answer 27

B. 12” to 5’ 603.4.3 pg 45

Question 28

29. A carbonated beverage machine cannot have copper tubing in the system downstream of the back flow preventer. A. True B. False

Answer 28

A. True 603.5.12 pg 47

Question 29

30. The diameter of a waste and overflow for a bathtub must not be less than ____ inches? A. 1 1/4 B. 2 C. 1 1/2 D. Both A and B

Answer 29

C. 1 1/2 702.1 pg 65

Question 30

31. The minimum gallons per minute discharge capacity of a sewage pump servicing water closets or urinals is not less than____gpm? A. 10 gpm B. 15 gpm C. 20 gpm D. 25 gpm

Answer 30

C. 20 gpm 710.3 ft 1 pg 71

Question 31

32. Primer must comply with ASTM standard number ____? A. 13 B. 14 C. F-656 D. None of the above

Answer 31

C. F-656 B 605.12.2 pg 54, 68

Question 32

33. What is the minimum air gap required for a drinking fountain when not affected by a nearby wall? A. 1 1/2” B. 2” C. 1” D. None of the above

Answer 32

C. 1” 603.3.3 pg 45

Question 33

34. Plastic waste piping passing through studs or plates shall be protected the same as required for copper tubing A. True B. False

Answer 33

A. True 312.9 pg 24

Question 34

35. The minimum size vent that can be installed in any plumbing system is 1 1/2” A. True B. False

Answer 34

B. False 703.2 pg 67

Question 35

36. How many fixtures located in the same room can be supplied with a 1/2” water pipe? A. 3 B. 2 C. 4 D. Size per chart

Answer 35

610.4 pg 61

Question 36

37. A transition coupling without a shield may be used above ground level. A. True B. False

Answer 36

B. False 705.10 pg 69

Question 37

38. The orifice of the jet in a drinking fountain must be at least ____ inches above the rim of the basin. A. 1” B. 1/2” C. 1 1/2” D. 1/4”

Answer 37

A. 1” Table 603.2 pg 43

Question 38

39. Solvent weld joints in PVC pipe must include applying contrasting color to the pipe and the fitting. A. True B. False

Answer 38

A. True 605.12.2 pg 54 705.6.2 of 68

Question 39

40. What is the minimum pitch of a 2” pipe to be maintained on a horizontal fixture branch? A. 1/4” B. 1/16” C. 1/8” D. 1/2”

Answer 39

A. 1/4” 708.1 pg 70

Question 40

41. The discharge pipe from a relief valve shall be full size and run within _____inches of the floor or safe place of disposal. A. 12 inches B. 10 inches C. 15 inches D. 18 inches

Answer 40

D. 18 inches 608.5 pg 56

Question 41

42. The stand pipe for clothes washer shall: A. Have the trap installed at least 6” above the floor B. Have a minimum trap size of 1 1/2” C. Be a maximum of 30” long D. All of the above are correct E. Only A and C are correct

Answer 41

E: only A and C are correct 804.1 pg 78

Question 42

43. All pipes passing through of in contact with cinder, concrete, or other corrosive materials shall be protected against external corrosion by protective coating, wrap, or other means. A. True B. False

Answer 42

A. True 312.16 pg 24

Question 43

44. Indirect waste connections shall be provided for the drains, overflows and relief vents from the waste distribution system by means of ___? A. An indirect waste B. An air break C. An air gap D. B and C

Answer 43

D. Both B and C, an air gap and air break 801.4 pg 77

Question 44

45. The distance between cleanouts shall not exceed ____? A. 50’ horizontal for all pipes 3” or less B. 100’ horizontal for all pipe C. 50’ horizontal and vertical for all pipes 3” or less D. Both A and B correct

Answer 44

B. 100’ horizontal for all pipe 706.4 pg 70

Question 45

46. Water meters shall be placed at least ____ inches above the finished floor. A. 6” B. 8” C. 10” D. 12”

Answer 45

D. 12” 609.12 pg 57

Question 46

47. Commercial food waste grinders shall discharge to a grease interceptor. A. True B. False

Answer 46

B. False 1014.1.3 pg 87

Question 47

48. What type of material is not permitted for the waste piping of a urinal? A. Plastic B.copper/drawn brass C. Steel D. Cast iron

Answer 47

B. Copper/drawn brass 402.6. Pg 29

Question 48

49. The maximum of one approved slip joint fitting shall be permitted on the ____ side with an approved trap adapter. A. Inlet B. Both inlet and outlet C. Outlet D. Only on p-traps

Answer 48

C. Outlet 49 1003.2 Pg 85

Question 49

50. The underground water service and building drain or sewer shall not be less than ____ feee apart horizontally, if separated by contaminated soil. A. 5 feet B. 6 feee C. 10 feet D. By administration authority

Answer 49

C. 10 feet 609.6.1 pg 57