Exam Prep Questions

Question 1

when using Oxy-Fuel cutting and welding equipment, a flashback arrestor protects?

A flame travelling into the hoses
B bright flashes
C electrical shock
D material blowback

Answer 1

A flame travelling into the hoses

Question 2

What is the definition of a class B fire?

A wood paper trash etc
B flammable liquids (oil)
C electrical fires
D combustible metals

Answer 2

B flammable liquids (oil)

Question 3

what procedure is used to determine if additional PPE is required for a specific task on a job site?

A ask the site Forman
B complete a hazard assessment
C observe what other workers are wearing
D request information at the next meeting

Answer 3

B complete a hazard assessment

Question 4

what additional equipment is required at the building end of a PE (polyethylene) water service installation?

A pressure relief filled with a thermal expansion compensator
B pressure reducing valve with bypass
C check valve with diaphragm tank
D testable backflow preventer

Answer 4

C check valve with diaphragm tank

Question 5

what phase of electricity does a large commercial laundry dryer operate on?

A single phase
B double phase
C triple phase
D quad phase

Answer 5

C triple phase

Question 6

A water closet seat used in a public washroom must be?

A cover less type
B plastic non permeable type
C Round type
D elongated open front type

Answer 6

D elongated open front type

Question 7

pressure balanced, or thermostatic mixing valves shall be designed so that the outlet water temperature does not exceed ….

A 39c
B 49c
C 59c
D 99c

Answer 7

B 49c

Question 8

what is the maximum pressure allowed within a domestic water system before pressure reducing valves are needed?

A 78.9 psi
B 505 KPA
C 550 KPA
D 70.9 psi

Answer 8

C 550 kpa

Question 9

if four showerheads are installed along a wall, what would the minimum measurement be between the two outermost heads?

A 750mm
B 2.25m
C 1500mm
D 3m

Answer 9

B 2.25m

Question 10

A backwater valve may be installed in a building drain provided that it is…

A properly vented
B normally open
C 3” or larger
D trapped upstream

Answer 10

B normally open

Question 11

when a well pump turns on as soon as a faucet is used, the most likely problem is…

A waterlogged pressure tank
B defective pressure switch
C foot valve not holding
D pump impeller is worn out

Answer 11

A waterlogged pressure tank

Question 12

what material is used in a water softener media tank?

A activated carbon
B salt/brine
C Charcoal
D ion-exchange resin

Answer 12

D ion-exchange resin

Question 13

A private domestic water system uses a pressure switch for the pump. What is the preset pressure differential on the switch?

A 103 KPA - 15 pis
B 138 KPA - 20 psi
C 207 KPA - 30 psi
D 241KPA - 35 psi

Answer 13

B 138 KPA - 20 psi

Question 14

The relief valve on a RP is discharging intermittently. What is the cause?

A test valve 4 is leaking
B shut off valve is open
C pressure fluctuations upstream
D expansion of water downstream

Answer 14

C pressure fluctuations upstream

Question 15

A long straight horizontal run of hot water copper piping is being installed. What is required to prevent damage to the piping?

A isolation valves
B expansion joints
C thermocouple
D insulation

Answer 15

B expansion joints

Question 16

A medical gas system has a in-line high-pressure sensor. Where is the sensor located?

A downstream of the terminal unit
B upstream of the pressure regulator
C upstream of the main shut off valve
D downstream of the pressure regulator

Answer 16

D downstream of the pressure regulator

Question 17

The bypass orifice in a flushometer is partially plugged. What is the result?

A short flush cycle
B long flush cycle
C constant flush
D static flush

Answer 17

B long flush cycle

Question 18

Coliforms are detected in a potable water system. What equipment is required to treat the water?

A media filter
B reverse osmosis system
C chlorine injection system
D manganese green sand filter

Answer 18

C chlorine injection system

Question 19

which are the minimum required fixtures to be installed in a dwelling unit? (4)

Answer 19

water closet - basin - sink - bathtub

Question 20

for all fixtures that have a permitted supply pipe size of 3/8” what is the maximum length of the connecter to supply water to the fixture?

A 750mm
B 100mm
C 300mm
D 2000mm

Answer 20

A 750mm

Question 21

What is the minimum size of the air break if the fixture drain is 3”

Answer 21

3”

Question 22

What is the minimum size of an air gap?

Answer 22

25mm or 2x the pipe diameter

Question 23

which device is responsible for turning a well pump on and off?

Answer 23

Pressure switch

Question 24

The maximum temperature of sewage allowed to discharge is …

A 50c
B 65c
C 70c
D 75c

Answer 24

D 75c

Question 25

A sewage ejector pit with a 4” inlet requires what size vent?

Answer 25

3”

Question 26

how would you increase the length of a flush o meter A turn regulating screw, clockwise B turn, regulating screw counterclockwise C remove vacuum break D throttle the stop valve

Answer 26

B Turn regulating screw counter clockwise

Question 27

A group of six wall hung carrier water closets are connected to the same horizontal correctly graded soil branch, and the centre of the fittings are all at the same height. How is this made possible? A by using mounting bolts B by correctly, adjusting the adjustable extension C by adjusting the face plate D by installing carriers at different heights to allow for the correct grade

Answer 27

C by adjusting the face plate

Question 28

A pressure switch is set for 35 psi cut in and 55 psi cut out. What is the recommended air pressure on the diaphragm tank for best system performance? A 3 to 5 psi below cut in pressure B maximum of 55 psi C minimum of 35 psi D 3 to 5 psi below cut out pressure

Answer 28

A 3 to 5 PS below cut in pressure

Question 29

what piping material would be used in a dairy for conveying milk products? A copper B glass C PVC – XFR D stainless steel

Answer 29

D stainless steel

Question 30

what colour coating is used for medical air gas labelling? A green and white B black and white C blue and silver D yellow and silver

Answer 30

B black and white

Question 31

what is the minimum allowable grade for copper piping which is to be used in a medical gas system?

Answer 31

Type L copper decreased, and cleaned

Question 32

which valve is best suited for industrial slurry processing application? A knife gate valve B solid wedged gate valve C plug disc globe valve D compression disc globe valve

Answer 32

A knife gate valve

Question 33

where does the refrigerant absorb heat in a refrigeration system? A compressor B condenser C expansion valve D evaporator

Answer 33

D evaporator

Question 34

what problem is likely to arise when draining and refilling a heating system in an apartment building? A radiators on the bottom floors, may get airlock B radiators on the top floor may get air locked C could cause the boiler to dry fire since there is no water in the system D the velocity of the water refilling in the system, may cause pipes to freeze and split

Answer 34

B radiators on the top floor may get air locked

Question 35

A circulating pump is leaking from the bearing assembly. How would one repair such problem?

Answer 35

Replace bearing assembly

Question 36

what must be considered when positioning a boiler in a mechanical room?

Answer 36

Allow room for access and service

Question 37

What can be installed to fix an uneven distribution of water in a heating system?

Answer 37

Balancing valve

Question 38

what is the first action taken when the boiler is firing and no water is in the site glass

Answer 38

Shut off fuel supply to the boiler

Question 39

At what angle do you bevel pipe before it is to be welded?

Answer 39

37 1/2 *

Question 40

At what angle do you flare a pipe to when making a flared connection?

Answer 40

45*

Question 41

when using ABS glue and -15°C, you must do what the glue?

Answer 41

Dilute the glue

Question 42

A 1/4 bend fitting is also known as a

Answer 42

90

Question 43

a 1/8 bend fitting is also known as a

Answer 43

45

Question 44

what is needed in manholes deeper than 1 m?

Answer 44

A corrosion resistant ladder

Question 45

an “air _______” refers to an indirect connection where a drain line from a fixture or appliance discharges into a receptor below flood level room

Answer 45

Break

Question 46

what device controls the flow in a in floor heating system?

Answer 46

Balancing valves

Question 47

if a ladder is extended 40 feet up, how far away from the wall is the base of the ladder?

Answer 47

10’ (4:1)

Question 48

how far (minimum distance) does dirt/soil need to be from a shored trench or hole A 2m B 1.5m C 1m D .5m

Answer 48

C 1m

Question 49

what gives you information on hazardous materials? A OHSA B CSA C MSDS D WSIB

Answer 49

C MSDS

Question 50

what gives you information on hazardous materials? A OHSA B CSA C MSDS D WSIB

Answer 50

C MSDS

Question 51

four solid ground, at what depth do you require shoring? A 3’ and deeper B 4’ and deeper C 5’ and deeper D 6’ and deeper

Answer 51

B 4’ and deeper

Question 52

what is the definition of a class a fire?

Answer 52

fire involving wood, paper, cloth, rubber trash

Question 53

what is the minimum horizontal distance between showerheads?

Answer 53

750mm

Question 54

at what height is a thermostat installed?

Answer 54

5 feet

Question 55

how often should the suspension of a hardhat be replaced?

Answer 55

12 months

Question 56

What class of hardhat is impact and puncture resistant?

Answer 56

class C

Question 57

vertical piping must be supported at intervals, not exceeding A every other story B every 7.5 m C every story D both A and B

Answer 57

D both A and B

Question 58

The proper torque setting on a MJ coupling is … A 60lb B 50lb C 40lb D 20lb

Answer 58

A 60lb

Question 59

What measurement is considered to be standard rough distance for a water closet from finish wall

Answer 59

12”

Question 60

what is the minimum percentage of oxygen content that is considered to be safe with a confined space?

Answer 60

19.5%

Question 61

what is the calculation from feet to meters?

Answer 61

x .304

Question 62

what is the maximum developed length of any fixture outlet pipe? A 750mm B 600mm C 1050mm D 1200mmm

Answer 62

D 1200mm

Question 63

What is the maximum allowable vertical fall for a water closet trap arm?

Answer 63

1m

Question 64

what is the minimum depth of a trap seal required for a laboratory trap? A 32mm B 38mm C 50mm D 76mm

Answer 64

B 38mm

Question 65

what is the maximum temperature at which water can discharge directly into a DWV system? A 68c B 75c C 88c D 91c

Answer 65

75c

Question 66

what is the minimum size of air brake required for a 1 inch drain pipe serving an indirectly connected appliance? 1” 1 1/2” 2” 3”

Answer 66

1”

Question 67

what is atmospheric pressure?

Answer 67

14.7 psi

Question 68

how many BTUs are required to raise the temperature of one imperial gallon of water by 1°F 5 btu 7.5 btu 10 btu 25 btu

Answer 68

10 btu

Question 69

which type of pump is most suitable for private water supply deep well application? Piston Gear Diaphragm Jet centrifugal

Answer 69

Jet centrifugal

Question 70

horizontally run 3/4 type M copper must be supported every 1 m 1.2 m 2.5 m 3 m

Answer 70

2.5 m

Question 71

Water that is determined to have a pH of 5.5 is considered to be

Answer 71

Mildly acidic

Question 72

water with the pH level of 8 is considered to be classified as …

Answer 72

2-7 = Acidic (corrosive) 7-12 = Alkaline (erosive) Sooooo ph of 8 would be slightly alkaline

Question 73

When a copper tube boiler is fired and begins to heat the water, a loud banging noise and vibration comes from the boiler. What might cause this condition? A flu gas temperature is too hot B the copper tubes are calcified and flow is restricted through the boiler C water is being forced through the exchanger by an oversized circulator D a faulty check valve within the water feed valve is allowing waterhammer

Answer 73

B the copper tubes are calcified and flow is restricted through the boiler

Question 74

what is the maximum horizontal offset permitted in a 3” stack that is serving as a wet vent?

Answer 74

2.5m

Question 75

what is the maximum horizontal offset permitted in a 2“ wet vent ?

Answer 75

1.2m

Question 76

when sizing a water service and distribution system, which variable will have the greatest effect on the available water pressure to a plumbing fixture? A length of the building B height of the building C total fixture unit load D number of fixtures

Answer 76

B height of the building

Question 77

which joining procedure is not proved for copper water service pipe low-grade and under the building? A flaring the pipe B compression fittings C braising the joint D A B & C are all approved

Answer 77

B compression fittings (compression fittings can’t be used underground underneath a building)

Question 78

A shallow well has water within ___ of the pump inlet 10’ 20’ 25’ 30’

Answer 78

25’ a well over 25’ is considered a deep well

Question 79

moderately hard water is ____ milligrams per litre 0-50 50-100 100-200 200-400

Answer 79

100-200 MG/L

Question 80

an inspection of a hot water heating system shows that the system pressure is in access of the designed operating pressure. Which device would cause this problem? Circulator Water feed valve Thermostat control unit Pressure relief valve

Answer 80

Water feed valve

Question 81

what piping procedure will assist in the removal of air from a hydronic heating system? A install air vents at all changes of direction B grade main piping up in the direction of flow C diaphragm tank to have an automatic air vent D system mains to use concentric fittings

Answer 81

Grade main piping up the direction flow

Question 82

where would an in-line flow switch? Be located on a domestic hot water boiler? A hot water supply line B hot water return line C boiler feed D located immediately after boilers back flow preventer

Answer 82

B hot water return line

Question 83

Latent Heat of fusion is the amount of heat required for a substance to change from a …. A gas to a liquid B liquid to a gas C solid to a gas D solid to a liquid

Answer 83

D solid to a liquid

Question 84

in a steam heating system, the vertical steam supply pipes are called Risers Returns Up feeds Wet lines

Answer 84

Risers

Question 85

The most common cause of feeder or low water fuel cut off trouble is the operators failure to observe the … Blowdown instructions Fuel calibration sequence Water treatment limitations Low water control calibration

Answer 85

Blowdown instructions

Question 86

if a pump on a heating system sounds like it’s pumping gravel, the most likely problem is Lack of balance Worn bearings Loose couplings Cavitation

Answer 86

Cavitation

Question 87

The steam boiler component used to lower the concentration of dissolved impurities in the boiler water is the … Blow off connection Concentrator Feed connection Settlement reduction valve

Answer 87

Blow off connection

Question 88

to prevent cross connections from occurring between medical gas cylinders, each gas has connections of specific size to prevent accidental hook up of the wrong gas. What is this system? A left right nipple connections B colour-coded stickers C diameter index safety system D diameter index sizing system

Answer 88

C diameter index safety system

Question 89

how is medical gas pipe stored? A in a locked and secured room B decreased, capped and on a shelf C decreased, capped and vertically upright D just like copper water pipe

Answer 89

C decreased, capped and on a shelf

Question 90

The term nominally vertical means A deviation from the true vertical by not less than 45° B deviation from the true vertical but not more than 45° C deviation from true vertical by not more than 44° D deviation from true vertical by not less than 44°

Answer 90

A deviation from true vertical by not less than 45°

Question 91

an interceptor with an effective water seal of not less than 38 mm may serve as a trap T or F

Answer 91

T