Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Red Seal Prep > PLUMBING > Flashcards

PLUMBING Flashcards

1
Q

A 60 US gallon water heater weighs 52.5lbs when its empty. How much does it weigh when its full?

A

552.3lbs

60usgal x 8.33lbs/usgal = 499.8lbs

499.8lbs + 52.5lbs= 552.3lbs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is installed either as part of a grease interceptor or immediatly at the inlet connection point to make it more efficient?

A

Flow control device

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What would be the result of a partially plugged bypass orifice in a flushometer?

A

Long flush cycle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The inner dimmension of a grease interceptor measures 9’ long, 4’6” wide and 5’ deep with a required 20% free board. What is the liquid capacity in the interceptor in Imp gallons?

A

9’ x 4.5’ x 5’ = 202.5cubic feet

202.5cubicft x 0.8(20%) =162cubicft

162cubicft x 62.4lb/cubicft =10108.8lb

10108.8lb / 10impgal/lb = 1010.88impgal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When cutting borosilicate glass tube what lubricant should be used?

A

Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What length of cast iron soil pipe should be removed when installing an MJ wye?

A

1/4” to 1/2” longer than the wye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What method, in addition to concrete thrust blocks, can be used to further restrain spigot PVC water service joints from seperating?

A

Serrated harnesses with lugs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the required flow rate for a system that has a total heat loss of 175000 BTU and a DELTA T of 15°F?

A

(175000 BTU/hr) / (8.33lb/usgal x 15°F x 1 BTU/lb/°F)

After units cancel
175000 (hr) / (8.33 (usgal) x 15)
175000 (hr) / 124.95 (usgal)

= 1400.56 USgal/hr

(1400.56USgal/hr) / (60min/hr)

= 23.3 GPM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What effect would a larger DELTA T have on an appliance?

A

BTU output would increase

  • increase water temp
  • decrease air temp
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

A hydronic heating system requires an in-line flow switch. Where would this type of switch be located?

A

Supply main

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is required when installing long, straight horizontal or vertical runs of copper domestic hot water piping?

A

Expansion joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the ideal DELTA P for compressed air systems?

A

15 psi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Intercoolers are installed with which style of compressor?

A

On two stage compressors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Air intakes for compressor systems should be located where?

A

In the coolest place possible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The inspector can ask for a minimum of ___ fittings in a medical gas to be removed and inspected to see if there is oxidation present?

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Where is the in-line high pressure sensor for a medical gas system located?

A

Downstream of the pressure regulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Freeze packs are designed to work on ______ water

A

Standing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the minimun size of copper tube permitted for medical gas distribution systems?

A

1/2”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

If performing hot work on a frozen line what must be done?

A

Re apply freeze pack to the site every 15 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

All medical gases must be tested for the purity of the gas. What concentration must those gases be at?

A

100% oxygen, nitrogen and nitrous and 21% for medical air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

If you have a medical gas system with with an anticipated operating pressure of 125 psi what pressure test would it need to maintain to pass inspection?

A
  1. 5 psi for 24 hours

1. 5x operating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Which fixtures and appliances must be installed with a shut-off valve in a public building?

A

All fixtures and appliances

Private (residential) only requires water closet, building iso and hot water tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What water treatment equipment is required if coliforms are detected in a water supply?

A

Chlorinator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

If there is a pressure of 50 psi at street level, how high will the pressure lift water contained in a 2” veritcal water pipe?

A

50psi x 2.31psi/foot = 115.5’

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

A jet pump was seen operating properly at instllation. The installer properly set the cut in and cut out to 30-50psi. Months later the owner is seeing pressures as high as 70 psi before the pump shuts down. What is most likely the reason?

A

Obstructed or slightly kinked pressure switch tubing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is the minimum size water service?

A

3/4”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Polybutylene piping should not come in contact with what?

A

Chlorine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What is your grade % if you have 216” of drop and 500’ of run?

A

500’ x 12” = 6000”

6000” / 216” = 0.036

0.036 x 100 = 3.6%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

How many GPG does soft water have?

A

Less than 1 gpg (hardness)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Where a 4” building trap is installed in a system what provisions must be met?

A
  • it must have a cleanout upstream and downstream of the building trap
  • must have a 4” fresh air inlet not more than 1.2m upstream of the building trap
31
Q

What is a class K fire extinguisher used for?

A

Grease

32
Q

What device is installed on the downstream side of a high pressure steam safety valve that vents to the roof?

A

Drip pan elbow

33
Q

What is the purpose of an insulated service valve insatlled on gas pipe exiting the ground and entering the building?

A

It breaks the contact between the ground and the building piping

34
Q

How should you properly prepare a CPVC end?

A

Deburr and bevel

35
Q

Regarding DWV piping, what is the maximum plus or minus pressure allowed in a system?

A

1” WC

36
Q

A PVC DWV system is running horizontally for 136m, how many clevis hangers will need to be ordered?

A

PVC/ABS hanger spacing = 1.2m

136m / 1.2m = 113.333333

Round up add 1

=115

37
Q

What can be installed to correct periodic discharge from a reduced pressure principle backflow preventer when the water distribution pressure is expected to fluctuate?

A

Install a swing check upstream of the RP

38
Q

What would the size of the required yoke vent be in a high rise if the vent stack is 2” and the waste stack is 3”?

A

11/2”

1 size smaller than smallest connected pipe

39
Q

The base of a soil stack is 6” in diameter and the stack vent on top of it is 3” in size. The stack is required to have a nominally horizontal offset greater than 1.5m. The offset relief vent required on either side of the offset will be required to be what size?

A

2”

1 size smaller than the stack vent

40
Q

What is the minimum sized vent that must be provided for any future installations in a building?

A

11/2”

41
Q

A flat roof that measures 25m x 50m with a perpendicular wall that is 7m x 50m will require what size leader if local rainfall intensity is 20mm for 15 minutes?

A

25m x 50m = 1250m

7m x 50m = 350m
- Take 50% of perpendicular wall area
350m x 0.5 = 175m

1250m + 175m = 1425m

1425 x 20(rainfall intensity) = 28500

Size off of 2.4.10.11 (6” leeder)

42
Q

What fitting would be used to attatch a field cut glass tube to a non-field cut glass tube?

A

Bead to Plain

43
Q

What decice is required on a water supply connecting to the bottom of a commercial hot water heater?

A

Vaccume relief valve installed at least 6” above the tank

44
Q

What provision must be made for a gas room heater insatalled in a hallway in a seniors home?

A

Must be vented type

Applicable in any public place

45
Q

How should a threaded joint be made between threaded galvanized steel piping and copper tubing?

A

Brass MIP

46
Q

What determines the minimum size of a suction pipe on a well pump?

A

Size of the inlet of the pump

47
Q

What is the sacrificial anode in a hot water tank manufactured from?

A

Magnesium

48
Q

Steel piping comes in what usual lengths?

A

6m

21 feet in the real world

49
Q

What color codes are type k, l and m copper?

A

K (kermit) = green

L (lake) = blue

M (murder) = red

50
Q

What type of thread is on acetylene fittings?

A

Left

51
Q

A 3/4” extracted tee may be formed from?

A

1” type K

Tee is 1 size smaller than pipe size and always use type K

52
Q

What force would be exerted on a 9” blind flange at the base of a 30’ column filled with water?

A

Convert feet to psi
30’ x 0.433psi/foot = 12.99 psi

Find surface area of flange
A= 3.14(4.5)Squared
A= 63.585

63.585 x 12.99 = 825.98psi

53
Q

How do you convert height into pressure?

How do you convert pressure into height?

A

feet x 0.433

54
Q

What should the relief valve on a compressed air receiver tank be set to discharge at if the cut out pressure of the compressor is set to 45psi?

A

55 psi

10psi above cut out

55
Q

What size is the cleanout on a 6” sanitary building drainas it exits a building?

A

4”

56
Q

What backflow preventer is not testable?

A

DuC

Dual check valve

57
Q

How do you determine maximum trap arm length?

A

Fall of 1 pipe diamter

58
Q

What is the maximum practical lift of a shallow well pump?

A

25’

59
Q

What provision must be made for an autopsy table that receives potentially dangerous bio-hazard waste?

A

Must be installed with a cleanout above flood level rim

60
Q

How should piping in a pneumatic system be installed?

A

Graded towards the oulets with branches rising up off the mains

61
Q

A combined building sewer has a sanitary hydraulic load of 549 fixture units and 8 rainwater leaders with 2750 litres each. What size is the sewer graded at 1%?

A

2750L x 8 = 22000L

549 FU X 9.1L/FU = 4995.9L

22000L + 4995.9L = 26995.9

Size according to 2.4.10.9 (10”)

62
Q

How many pounds are in a US gallon?

A

8.33 lb/gal

Example…

60USgal x 8.33 lb/USgal = 499.8lb

63
Q

How much does 1 cubic foot of water weigh?

A

62.4 lb/cubicft

64
Q

How many litres are in an imperial gallon?

A

4.54 l/impgal

65
Q

How do you calculate linear expansion?

A

Table A-2.3.3.9.

Length change = original length x coefficient of expansion x temp change

66
Q

The waste for the closed coupled tank type W.C. is roughed in at?

A

305 mm (12”) from finished wall

67
Q

A blowout W.C. cannot be?

A

Horizontally wet vented

68
Q

A floor drain can be protected from back flow by a?

A

Gate valve

Screw cap

69
Q

The minimum distance permitted between two shower heads is?

A

750mm

70
Q

A relief vent is most closely related to a?

A

Vent stack

71
Q

Not more than how many showers can be served by one drain?

A

6

72
Q

A yoke vent is required when the soil or waste stack extends through a number of storeys. An additional circuit vent is also required when?

A

More than 8 fixtures are installed between vents

73
Q

The minimum air break for an indirect waste pipe that is 1 ¼” is?

A

1 1/4”

74
Q

Which does not require a vent?

A

a) Lavatory trap
b) Trap forming part of an indirect drainage system
c) Trap on a subsoil drainage system
d) Sewage sumpe

Either b) or c)

Answer: c)

Red Seal Prep (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions