CT Red seal prep #4

Question 1

What is the name for the entire recirculation of a swimming pool’s water?

a) Rate of circulation.
b) Rate of turnover.
c) Rate of exchange.
d) Rate of transfer.

Answer 1

b) Rate of turnover.

Question 2

What must a toilet seat in a public restroom be?

a) round type
b) plastic non-permeable type
c) elongated open front type
d) cover-less type

Answer 2

c) elongated open front type

Question 3

What is necessary for the installation of a deep well jet pump?

a) Relief valve is required with centrifugal jet pumps.
b) Foot valve is required on the jet suction line.
c) Modulating valve is required on the pump suction line.
d) Check valve is required on the pump discharge.

Answer 3

b) Foot valve is required on the jet suction line.

Question 4

How many 2 1/2 in. When installing a 1000 gpm fire pump, should hose valves be mounted on the test header?

a) 5
b) 1
c) 4
d) 8

Answer 4

c) 4

When installing a 1000 gpm fire pump, four 2 1/2 inch hose valves should be
mounted on the test header. This configuration is typically used to test the
capacity of the pump.

Question 5

A 1 1/2 in. A circuit vent serves a branch that has eleven linked WCs. A vent is positioned downstream of the most downstream toilet. Where may an extra
circuit vent be attached to the branch if required?

a) Between the second and third most upstream WC’s.
b) An additional circuit vent is not required.
c) Between the two most downstream WC’s.
d) Between the fifth and sixth most upstream WC’s.

Answer 5

b) An additional circuit vent is not required.

Question 6

What is the minimum size of a toilet’s drain?

a) 3
b) 2
c) 4
d) 2 ½

Answer 6

a) 3

Question 7

on what is the water pipe sizing technique based?

a) loss of pressure or friction through a water meter
b) loss or gain in static pressure
c) A system of pressure losses or requirements
d)

Answer 7

c) A system of pressure losses or requirements

Question 8

What colour is the M type?

a) Blue
b) Red
c) Yellow
d) Black

Answer 8

b) Red

Question 9

What are globe valves, gate valves, and plug valves examples of?

a) manual valves
b) hydraulic valves
c) solenoid valves
d) pneumatic valves

Answer 9

a) manual valves

Question 10

How would you extend the flush duration on a flushometer?

a) remove vacuum breaker
b) turn regulating screw counter clockwise
c) throttle the stop valve
d) turn regulating screw clockwise

Answer 10

b) turn regulating screw counter clockwise

Question 11

How many cubic metres of water are in the tank if a non-pressurized holding tank’s pressure gauge shows 24.3kpa?

a) 4.35m deep
b) 3.58m deep
c) 1.95m deep
d) 2.48m deep

Answer 11

c) 1.95m deep

he depth of water in a non-pressurized holding tank can be calculated based
on the pressure gauge reading. The given pressure gauge reading corresponds
to a depth of approximately 1.95 meters.

Question 12

Using an offset relief vent inside a building’s DWV system results in a 6-inch
diameter at the base of the stack and a 3-inch diameter for the stack vent. Which of the following best describes the dimension of the offset relief vent?

a) 3in
b) 2in
c) 1 ½ in
d) 1in

Answer 12

a) 3in

he dimension of the offset relief vent should be the same as the stack vent
diameter, which is 3 inches in this scenario.

Question 13

What is the smallest capacity for a water service?

a) ¾
b) 1
c) ½
d) 2

Answer 13

a) ¾

Question 14

The water with a pH of 5.50 would be considered?

a) very alkaline
b) mildly alkaline
c) very acidic
d) mildly acidic

Answer 14

c) very acidic

Question 15

Which installation approach for a wall-mounted toilet maintains a watertight seal on the waste connection?

a) Horn wax seal is positioned and compressed by adjustable nipple.
b) Adjustable nipple is set for compression of gasket.
c) Chair carrier is positioned close to the finished wall.
d) Back up nuts and washers are set 1/16” past wall.

Answer 15

a) Horn wax seal is positioned and compressed by adjustable nipple.

Question 16

50/50 solder joints are?

a) permitted on NH systems
b) permitted on systems containing less than 6lbs of Group 1 refrigerants
c) not permitted on any systems
d) are permitted on any system

Answer 16

c) not permitted on any systems

Question 17

Which of the following should be the fire protection system if a potable water supply supports a dry sprinkler fire protection system?

a) should be isolated from the potable water system by a listed alarm check
valve
b) should be isolated from the potable water system by a resilient seated check
valve
c) should be isolated from the potable water system by a backflow preventer
d) not required to be isolated from the potable water system

Answer 17

c) should be isolated from the potable water system by a backflow preventer

Question 18

How is a piece of field-cut glass pipe assembled with a piece of factorybeaded glass pipe?

a) Remove roughness from outside of the field cut and use manufacturer’s coupling designed for this application.
b) Remove roughness from the outside of field cut and use a rubber coupling
with stainless steel clamps.
c) Heat and bevel the field cut end of the pipe and use a rubber coupling with
stainless steel clamps.
d) Heat and bead the field cut end of the pipe and use manufacturer’s
coupling designed for this application

Answer 18

a) Remove roughness from outside of the field cut and use manufacturer’s coupling designed for this application.

Question 19

What is the size of the yoke vent when it is linked to a 2-inch branch and a
3-inch vent stack?

a) 3in
b) 2in
c) 1 ½ in
d) 1in

Answer 19

b) 2in

he size of the yoke vent when linked to a 2-inch branch and a 3-inch vent stack
should be 2 inches. This size is appropriate for venting the fixtures served by the
2-inch branch.

Question 20

On which fixture floor support would a large cast iron service sink be
mounted?

a) P-trap standard.
b) Lavatory chair carrier.
c) Cast iron floor flange.
d) Pressed steel wall bracket.

Answer 20

d) Pressed steel wall bracket.

Question 21

SPACER

Answer 21

SPACER

Question 22

Each end of a 100-meter-long, 4” cast iron storm drainage system is equipped with a hanger. How many hangers are necessary if the maximum spacing between supports is observed?

a) 37
b) 35
c) 36
d) 33

Answer 22

b) 35

 For a 100-meter-long, 4” cast iron storm drainage system with hangers spaced at
maximum intervals, 35 hangers are necessary to support the pipe, including
hangers at both ends.

Question 23

The estimated occupancy load of a retail centre was 5,400 people. Which of the following is the maximum number of urinals that may be substituted for water closets in men’s public restrooms?

a) 14 urinals
b) 10 urinals
c) 7 urinals
d) 6 urinals

Answer 23

c) 7 urinals

 For a retail center with an estimated occupancy load of 5,400 people, the
maximum number of urinals that may be substituted for water closets in men’s
public restrooms is typically 7 urinals.

Question 24

On the downstream side of a high pressure steam safety valve that vents to the roof, what device is installed?

a) Safety valve de-accumulator.
b) Double block and bleed.
c) Drip pan elbow.
d) Exhaust head.

Answer 24

c) Drip pan elbow.

Question 25

What device regulates the discharge intervals of effluent to a gravity-fed
distribution field?

a) Bell and siphon.
b) Pump control panel.
c) Effluent diverter valve.
d) Float switch.

Answer 25

a) Bell and siphon.

Question 26

Which of the following voltages provides the most energy efficiency?

a) 240 static voltage.
b) 220 line voltage.
c) 110 line voltage.
d) 120 static voltage.

Answer 26

a) 240 static voltage.

Question 27

A plumbing branch with 18 Fixture units (3 water closets included) is discharging into a stack. What is the minimum size and name of the stack immediately downstream from this connection?

a) 4” waste stack.
b) 4” soil stack.
c) 3” soil stack.
d) 3” waste stack.

Answer 27

b) 4” soil stack.

 For a plumbing branch with 18 Fixture units (including 3 water closets)
discharging into a stack, a 4-inch soil stack is the minimum size required. A soil
stack is designed to handle both waste and vent functions.

Question 28

The installation of an underground water service using thrust blocks. What other technique might be used to limit the joints?

a) Compression coupling.
b) Companion flange.
c) Flared coupling.
d) Continuous rodding.

Answer 28

d) Continuous rodding

Question 29

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

a) Size of the pump cylinder.
b) Size of the discharge opening in the pump.
c) Size of the inlet opening of the pump.
d) Distance from the pump to the water in the well.

Answer 29

c) Size of the inlet opening of the pump.

Question 30

The hot water that passes through components of portable systems or hot
water healing systems may reduce the pipe’s resistance to pressure and increase the amount of metal tubing and fitting.

a) rust
b) oxidation
c) corrosion
d) electrolysis

Answer 30

c) corrosion

Question 31

A pipe that links at its downstream end to two or more vent pipes and at its upstream end to a vent stack or stack vent is referred to be a?

a) common vent
b) branch vent
c) header
d) circuit vent

Answer 31

d) circuit vent

Question 32

What is placed to increase the efficiency of a grease interceptor?

a) Bypass valve.
b) Garbage grinder.
c) Inlet vent.
d) Flow control orifice plate.

Answer 32

d) Flow control orifice plate.

Question 33

A water closet bowl flushes slowly and sluggishly, but there is sufficient water
and the drain and vent are clean. What might be done to fix the issue?

a) Change the flush ball or flapper.
b) Clean out the under rim drillings.
c) Install a larger water line.
d) Open the supply valve fully.

Answer 33

b) Clean out the under rim drillings.

Question 34

How many flow-controlled roof drains would be need for a 90-by-50-meter
roof?

a) 6
b) 4
c) 7
d) 10

Answer 34

b) 4

Question 35

When the trigger is pushed on a Hilti powder-actuated fastening tool, the device does not fire. What is the first step you should take?

a) remove the cartridge
b) keep the tool in position and wait 30 seconds
c) inspect the magazine
d) depress the trigger again

Answer 35

b) keep the tool in position and wait 30 seconds

Question 36

How is the foundation formed inside a “poured-in-place” sanitary manhole?

a) Channeled away from direction of flow.
b) Channeled in direction of flow.
c) Graded from center of base to walls.
d) Level throughout.

Answer 36

b) Channeled in direction of flow.

Question 37

What plumbing procedures must be performed prior to covering a plumbing system?

a) Install, test, obtain a permit and inspect.
b) Obtain a permit, install, test and inspect.
c) Obtain a permit, install, inspect and test.
d) Install, test, inspect and obtain a permit.

Answer 37

b) Obtain a permit, install, test and inspect.

Question 38

Which table in the National Plumbing Code is used to establish the size of a building’s storm sewer?

a) 2.4.10.6.C
b) 2.4.10.6.B
c) 2.4.10.9
d) 2.4.10.6.A

Answer 38

d) 2.4.10.6.A

Question 39

How are bell and spigot plastic pipes joined inside a drainage system?

a) Cut pipe square, lubricate outside of pipe and inside of fitting and push pipe
together using a push bar or shovel.
b) Cut pipe square, ream inside and outside surfaces of pipe, lubricate outside
of pipe and inside of fitting and push pipe together using a push bar or shovel.
c) Cut pipe square apply solvent and primer to outside of pipe and inside of
fitting and push pipe together using a push bar or shovel
d) Cut pipe square, ream inside and outside surfaces of pipe, apply solvent and
primer to outside of pipe and inside of fitting and push pipe together using a
push bar or hovel.

Answer 39

c) Cut pipe square apply solvent and primer to outside of pipe and inside of
fitting and push pipe together using a push bar or shovel

Question 40

What determines the absorption rate of a septic field?

a) water table
b) percolation test
c) linear feet of leech field
d) soil analysis

Answer 40

b) percolation test

Question 41

Urinals are authorised in place of water closets in restaurants, providing the number of urinals does not exceed which of the following?

a) 1/5 of required number
b) 1/2 of the required number
c) 2/3 of the required number
d) 1/3 of the required number

Answer 41

d) 1/3 of the required number

 In restaurants, urinals are authorized in place of water closets, provided the
number of urinals does not exceed one-third of the required number of water
closets. This ratio ensures adequate facilities for both men and women.

Question 42

What is the name of the valve that shuts when the flow in a pipe line is reversed?

a) check
b) gate
c) butterfly
d) relief

Answer 42

a) check

Question 43

What negative impact does the addition of oxygen to copper alloys have?

a) alloy becomes brittle at higher temp
b) alloy becomes much heavier
c) alloy loses all its ability to conduct electricity
d) alloy becomes malleable and soft

Answer 43

a) alloy becomes brittle at higher temp

Question 44

The optimal position for installing a circulator pump in a hot water heating
system is?

a) on the supply before the expansion tank
b) on the supply after the zone valve
c) on the supply after the expansion tank
d) on the return close to the boiler

Answer 44

c) on the supply after the expansion tank

Question 45

When water is utilised in a building, the pump for the water pressure system cycles on and off extremely rapidly. Which ailment is the most likely culprit?

a) Diaphragm tank is water logged.
b) Pump pressure switch contacts are dirty.
c) Water supply to the pump is inadequate.
d) Pressure switch differential is too high.

Answer 45

a) Diaphragm tank is water logged.

Question 46

How many gallons does a home with a septic tank and four bedrooms hold?

a) 1000
b) 1200
c) 800
d) 900

Answer 46

b) 1200

Question 47

Occasionally, a water closet may seem to be filling with water while it is not in use, but the tank is not really full. Which strategy is used to rectify this issue?

a) Replace the tank ball or flapper.
b) Adjust the trip lever handle.
c) Adjust the ball cock assembly.
d) Partially close the water supply stop.

Answer 47

a) Replace the tank ball or flapper.

Question 48

Which of the following is utilised to create a threaded connection between galvanised steel pipe and copper tube?

a) dresser coupling
b) galvanized extension piece
c) brass male adaptor
d) copper extension fitting

Answer 48

c) brass male adaptor

Question 49

As a system activation device for which of the following kinds of sprinkler systems is a detector wire installed?

a) Wet.
b) Antifreeze.
c) Dry
d) Preaction.

Answer 49

d) Preaction.

Question 50

What does the acronym NPS relate to?

a) wall thickness
b) pipe size
c) threads per inch
d) thread taper

Answer 50

b) pipe size

Question 51

How many hand rotations should a correctly cut thread on black iron pipe
allow with a fitting?

a) 2 ½
b) 1 ½
c) 3 ½
d) 4 ½

Answer 51

b) 1 ½

Question 52

WCB standards stipulate that horizontally stored or transported acetylene cylinders must be repositioned in a vertical posture for a minimum of?

a) two hours
b) one hour
c) half an hour
d) one and a half hours

Answer 52

a) two hours

Question 53

A 4” cast iron pipe insulated with 1” is to pass through a wall. How wide must the diameter of the hole be?

a) 6.5in
b) 6in
c) 7in
d) 7.5in

Answer 53

c) 7in

Question 54

What may a 12” extracted tee be made from?

a) ½” type K
b) ¾” type M
c) ½” type L
d) ¾” Type K

Answer 54

b) ¾” type M

Question 55

Maximum horizontal hanger spacing for 1/2-inch CPVC pipe is?

a) 2 feet
b) 1 foot
c) 3 feet
d) 4 feet

Answer 55

c) 3 feet

Question 56

What is a fire of class “A”?

a) gasoline
b) electrical equipment, motors, switches
c) ordinary combustions like wood, paper, etc

Answer 56

c) ordinary combustions like wood, paper, etc

Question 57

According to percolation testing, the soil at the disposal field site has a percolation rate of 92 minutes per inch. What form of wastewater treatment system must be implemented?

a) Pressure distribution into a sand bed mound.
b) Pressure distribution into a chamber system.
c) Gravity effluent disposal system using perforated pipe.
d) Gravity effluent disposal system using chambers.

Answer 57

a) Pressure distribution into a sand bed mound.

With a percolation rate of 92 minutes per inch, a pressure distribution into a sand
bed mound system would be most appropriate. This type of system is effective in slowly percolating soils.

Question 58

What is necessary to finish the pipe installation while installing a Reduced
Pressure Principal backflow Preventer (RP)?

a) An air gap fitting on the relief port.
b) A direct waste connection to a floor drain.
c) An air gap immediately above a floor drain.
d) A pressure gauge on the upstream side of the device.

Answer 58

a) An air gap fitting on the relief port.

Question 59

The construction code stipulates that floor drains must be?

a) within a hydraulic elevator pit must discharge through an oil interceptor
b) within a car wash must discharge through an oil interceptor
c) is not required within the pit of a hydraulic elevator
d) in a parking lot must be provided with oil interceptors

Answer 59

a) within a hydraulic elevator pit must discharge through an oil interceptor

Question 60

What is the name of the sacrificial rod that is inserted in a water heater to prevent corrosion and prolong the tank’s life?

a) anti corrosion rod
b) anode rod
c) hot water rod
d) all of the above

Answer 60

b) anode rod

Question 61

The shift in direction of an 8-inch sanitary building sewer is more than 45 degrees. Where should manholes be installed if the entire developed length of the sanitary building sewer is 30 metres?

a) the point where the change of direction is greater than 45 degrees
b) manhole shall be provided so that the developed length of the building
sewer is 30 m from the building
c) the property line where the building sewer ends
d) manhole is not required

Answer 61

a) the point where the change of direction is greater than 45 degrees

Question 62

What is the correct process for repairing a damaged CPVC pipe fitting on a hydronic heating system?

a) Drain, isolate remove joint apply primer solvent weld to new spool and fitting
and install
b) Isolate, drain remove joint solvent weld to new spool and fitting and install
c) Isolate, drain remove joint apply primer to new spool and fitting and install
d) Isolate, drain remove joint apply primer solvent weld to new spool and fitting
and install

Answer 62

d) Isolate, drain remove joint apply primer solvent weld to new spool and fitting
and install

Question 63

To alter the vertical orientation of a single pipe line to horizontal, utilise a?

a) 90deg elbow
b) sanitary tee
c) 2” clean out
d) 45deg double tee

Answer 63

a) 90deg elbow

Question 64

What installation requirements must be followed to ensure the correct functioning of a water metre?

a) The fitting connection on the water meter inlet must be electrically
conductive.
b) The size of water meter is determined by the water service size.
c) The water meter is installed in a vertical position.
d) The water meter is installed in a horizontal position.

Answer 64

d) The water meter is installed in a horizontal position.

Question 65

Determine the amount of expansion caused by a 40oC temperature shift in
a 15-meter ABS pipe.

a) 56mm
b) 54mm
c) 48mm
d) 40mm

Answer 65

a) 56mm

 The amount of expansion caused by a 40°C temperature shift in a 15-meter ABS
pipe is approximately 56mm. This calculation is based on the coefficient of
thermal expansion for ABS pipe.

Question 66

What kind of protected plumbing connection is required for a commercial
kitchen combioven?

a) Air gap connection on waste line
b) Indirect waste connection to drainage system.
c) Atmospheric vacuum breaker on hot and cold water supply.
d) Exhaust vent to kitchen canopy with proving switc

Answer 66

b) Indirect waste connection to drainage system.

Question 67

When constructing six shower drains in a locker room, which plumbing configuration would be the most cost-effective?

a) A running trap with a relief vent.
b) A running trap with an individual vent.
c) Individual traps with individual vents.
d) Individual traps with a circuit and relief vent.

Answer 67

d) Individual traps with a circuit and relief vent.

Question 68

Every? horizontally installed 34” type M copper pipe must be supported.

a) 2.5m
b) 1.5m
c) 3.5m
d) 0.5m

Answer 68

a) 2.5m

Question 69

What is persistence?

a) a grounded wire
b) a broken wire
c) an open circuit
d) a complete electrical circuit

Answer 69

c) an open circuit

Question 70

What is the minimum size of the bidet’s trap?

a) 1 ¼
b) 1 ½
c) 2
d) 2 ¼

Answer 70

a) 1 ¼

Question 71

Which backflow prevention device cannot be tested?

a) DCAP
b) PVB
c) RP
d) DCVA

Answer 71

b) PVB

Question 72

Where in a room might a floor-mounted hydronic cooling convector be situated?

a) Near the occupied area of the room.
b) On the wall with the highest heat gain.
c) On the floor with the highest heat loss
d) On the wall with the lowest heat gain.

Answer 72

b) On the wall with the highest heat gain.

Question 73

What pipe configuration would guarantee that a plumbing device has ready access to domestic hot water?

a) Parallel piping loop on the water system
b) Recirculation line on the water system
c) Mixing valve piped with hot and cold water
d) Series piping loop on the water system

Answer 73

b) Recirculation line on the water system

Question 74

How deep must asbestos cement pipe laid under a 60 mm thick concrete floor be?

a) 400m
b) 600m
c) 550m
d) 200m

Answer 74

b) 600mm

Question 75

What are the benefits of using a conventional screwdriver?

a) Screws are available with this stile of head in a wide range of sizes
b) It is not necessary to maintain the end of the screwdriver in good condition
c) It can also be safely used as a pry bar
d) It can also be safely used as a chisel

Answer 75

a) Screws are available with this stile of head in a wide range of sizes

Question 76

The interior dimensions of a grease interceptor are 9’ in length, 4’ 6” in width,
and 5’ in depth with a 20% free board. What is the interceptor’s liquid capacity in
gallons?

a) 1565.2
b) 1430.4
c) 1550.25
d) 1211.76

Answer 76

c) 1550.25

The liquid capacity of a grease interceptor with internal dimensions of 9’ length,
4’ 6” width, and 5’ depth (with a 20% free board) is calculated by multiplying the
internal volume by 7.48 (to convert cubic feet to gallons). The calculation is (9’ x
4.5’ x 5’) * 7.48 = 1550.25 gallons

Question 77

This is the word for the beautiful metal shield or flange that is situated under the faucet handle. It also covers the wall or fixture hole and the faucet stem?

a) dove tail
b) fluer
c) Escutcheon

Answer 77

c) Escutcheon

Question 78

Which of the following metal alloys is not composed of iron?

a) SAE 1020
b) Iron
c) Brass
d) HSS

Answer 78

c) Brass

Question 79

The rough-in plumbing for a three-piece basement consists of a water closet, bathtub, and lavatory. Determine the size of the wet vent that must be installed.

a) 55mm
b) 50mm
c) 60mm
d) 70mm

Answer 79

b) 50mm

Question 80

What factors affect the size of a ball peen hammer?

a) By the length of its handle
b) By the diameter of its head
c) By the weight of its handle
d) By the weight of its head

Answer 80

d) By the weight of its head

Question 81

The developed length of a plumbing vent supplying a standard threepiece basement plumbing rough-in is 12 metres. What is the vent’s name and minimum size?

a) 11/2” circuit vent.
b) 11/2” continuous vent.
c) 11/4” continuous vent.
d) 11/4” circuit vent.

Answer 81

b) 11/2” continuous vent.

 For a plumbing vent with a developed length of 12 meters supplying a standard
three-piece basement plumbing rough-in, the minimum size and name of the
vent would be a 1 1/2” continuous vent. This size is sufficient for venting the
fixtures in a typical basement setup.

Question 82

Which of the following standards should be utilised while conducting pressure testing on standpipe system piping?

a) 180 psi for 2 hours, or 30 psi above pressure test on the sprinkler system.
b) 140 psi for 1 hour.
c) 200 psi for 2 hours minimum or 50 psi above maximum working pressure.
d) Operational pressure for 24 hours.

Answer 82

c) 200 psi for 2 hours minimum or 50 psi above maximum working pressure.

Question 83

A single-family home has water table issues and recurrent basement floods. A system of weeping tiles is proposed. How is the weeping tile connected to the building’s sanitary drain?

a) Connect the weeping tile through a trapped backwater valve.
b) Connect the weeping tile through a normally closed backwater valve.
c) Connect the weeping tile directly to the sanitary building drain.
d) Connect the weeping tile with a trap and normally open backwater valve.

Answer 83

b) Connect the weeping tile through a normally closed backwater valve.

Question 84

If gravity drainage to a sanitary drainage system is not an option, then the basement of a residential unit must?

a) connect required floors drain to tank(s) equipped with ejectors
b) connect a required floor drain to private sewage disposal system
c) connect a required floor drain to storm drainage system
d) not required to be provided with floor drain

Answer 84

a) connect required floors drain to tank(s) equipped with ejectors

Question 85

What is the weight of 135 cubic feet of water?

a) 8437.5lbs
b) 7975lbs
c) 8258.26lbs
d) 8015.5lbs

Answer 85

a) 8437.5lbs

 The weight of 135 cubic feet of water is 8437.5 pounds. This is calculated based
on the fact that one cubic foot of water weighs approximately 62.43 pounds.

Question 86

Which plumbing component would be placed immediately after an interceptor?

a) Cleanout fitting.
b) Enzyme injection point.
c) Flow control orifice.
d) Vent pipe.

Answer 86

a) Cleanout fitting.

Question 87

What drain size is required for a shower
stall?

a) 2
b) 1 ¾
c) 2 ½
d) 3

Answer 87

a) 2

Question 88

The function of a reverse flow check valve is to?

a) increase gas flow
b) degrease gas flow
c) check gas pressure
d) stop the reverse flow of gases

Answer 88

d) stop the reverse flow of gases

Question 89

How much GPG contains Soft water?

a) 1-2 gpg
b) less than 1 gpg
c) 2-3 gpg
d) 7-9 gpg

Answer 89

b) less than 1 gpg

 Soft water is typically defined as having less than 1 grain per gallon (gpg) of
hardness. This low level of hardness minerals results in the water being
considered ‘soft.’

Question 90

What tool should be used to test for a short circuit?

a) an ammeter
b) a wattmeter
c) a voltmeter
d) an ohmmeter

Answer 90

d) an ohmmeter

Question 91

What are the specifications for the nuts, washers, bolts, and screws used to join a floor flange and a water closet to a floor?

a) Nickel plated iron.
b) Zinc coated steel.
c) Brass plated steel.
d) Corrosion resistant.

Answer 91

d) Corrosion resistant.

Question 92

A project requires 360 feet of three-and-a-half-inch pipe. The capacity of a 3 12 inch pipe is nine times that of a 1 12 inch pipe. How many feet of 1 1/2-inch pipe are required for a comparable project?

a) 3240feet
b) 2480feet
c) 2860feet
d) 950feet

Answer 92

a) 3240feet

 If the capacity of a 3 1/2 inch pipe is nine times that of a 1 1/2 inch pipe, then
for a comparable project requiring 360 feet of 3 1/2 inch pipe, 3240 feet (360
feet x 9) of 1 1/2-inch pipe would be required.

Question 93

What is the connection between a “P” trap and a drain?

a) valve
b) coupling
c) trap adaptor
d) pvc couplings

Answer 93

c) trap adaptor

Question 94

A well with a watertight casing must maintain a minimum distance of? from
a septic system.

a) 15m
b) 10m
c) 5m
d) 25m

Answer 94

b) 10m

Question 95

What does the hand held shower pipework on a Roman tub connect to?

a) Hot/cold mixing valve.
b) Diverter valve.
c) Pressure balanced control.
d) Thermostatic mixing valve.

Answer 95

b) Diverter valve.

Question 96

This is used to join copper and galvanised pipe?

a) nipple
b) coupling
c) dielectric union
d) push fit connector

Answer 96

c) dielectric union

Question 97

What is the suggested maintenance strategy for an instantaneous water heater when the home water supply is hard?

a) Isolate and flush the unit with a vinegar solution.
b) Occasionally run it through a water softener.
c) Adjust the flow restricting device.
d) Reverse in and out lines occasionally.

Answer 97

a) Isolate and flush the unit with a vinegar solution.

Question 98

What is the phrase MJ pipe used to describe?

a) flared iron piping
b) hub and spigot iron piping
c) plain ended DWV cast iron piping
d) grooved iron piping

Answer 98

c) plain ended DWV cast iron piping

Question 99

A branch with 34 fixture units empties into a sewage sump. What is the needed minimum vent size for the sump?

a) 3
b) 1 ¼
c) 3 ½
d) 2 ¼

Answer 99

a) 3

Question 100

What is the maximum permissible horizontal offset for a 3” soil or garbage
stack that serves as a wet vent?

a) 1.6m
b) 2.5m
c) 2.4m
d) 1.6m

Answer 100

b) 2.5m

Question 101

How is movement caused by thermal expansion rectified or avoided?

a) installing fewer fittings
b) suspending piping at least 1M below joists
c) using heavier pipe
d) building expansion loops

Answer 101

d) building expansion loops

Question 102

What function does the evaporator serve in a cooling system?

a) Absorb heat from the refrigerant.
b) Regulate the refrigerant flow.
c) Absorb heat from the building air.
d) Release heat to the building exterior.

Answer 102

c) Absorb heat from the building air.

Question 103

What is the installation sequence for the discharge line from a sewage sump, in the direction of flow?

a) Connection to the sanitary sewer, union, check valve and shutoff valve.
b) Union, check valve, shutoff valve and connection to the sanitary system.
c) Connection to the sanitary sewer, union, shutoff valve and check valve.
d) Union, shutoff valve, check valve and connection to the sanitary system.

Answer 103

b) Union, check valve, shutoff valve and connection to the sanitary system.