Review #4

Question 1

What is the effect when a water line is reduced in size while the rate of flow is maintained?

Answer 1

There will be an increase in velocity and a reduction in pressure

Question 2

A common cause for loss of seal in a plumbing fixture trap due to siphonage is a clogged ____

Answer 2

Vent pipe

Question 3

To increase the pressure downstream of a pressure reducing valve, the plumber would turn the adjusting screw ____

Answer 3

Clockwise

Question 4

To shorten the flush of a “flushometer” valve turn the needle valve on the body of the flush valve ____

Answer 4

Counter clockwise

Question 5

A direct-acting aquastat will turn a boiler off on a ____ in temperature

Answer 5

Rise

Question 6

A reverse-acting aquastat will turn the _____ on when the temperature rises

Answer 6

Circulator

Question 7

The standard rough in from finished floor to the centreline of the waste outlet for a lavatory is

Answer 7

18”

Question 8

The standard measurement from the centre line of a tank-type toilet to the centre of the water supply is

Answer 8

6”

Question 9

Where proper grade on a building drain cannot be obtained, the sewer must be designed to provide a minimum flow rate of

Answer 9

2 foot/sec

Question 10

The maximum length of a water closet arm is

Answer 10

116” (3 m)

Question 11

The diameter of a stack vent is determined by

Answer 11

It’s developed length and total load

Question 12

The regenerating agent used in domestic water softeners is

Answer 12

Sodium chloride

Question 13

When the water level in a hot water heating system drops to an unsafe level, what is used to indicate this?

Answer 13

Low water cutoff

Question 14

This backflow preventer must not be installed upstream if a shutoff valve

Answer 14

AVB

Question 15

The minimum differential between the supply pressure and the zone of reduced pressure in an RPBA is ____ psid

Answer 15

2 psid

Question 16

The length of a vent header is determined by

Answer 16

It’s developed length from open air to the furthest fixture connection

Question 17

This type of hydronic heating system layout uses one pipe for supply and return as well as special diverter tees

Answer 17

Monoflow

Question 18

Backflow preventer found on a bidet

Answer 18

AVB

Question 19

A standard height above finished floor to the drain for a pedestal basin is

Answer 19

21”

Question 20

Barrier free means

Answer 20

Accessible to the physically challenged

Question 21

The type of valve most likely to be found directly inside a residential building at the end of a water service is

Answer 21

Compression stop-and-waste

Question 22

The type of valve used directly inside a commercial building is a

Answer 22

Gate valve or butterfly valve

Question 23

Vibration in a base mounted pump is likely caused by

Answer 23

Misalignment

Question 24

A cause of vibration in the suction lift of a pump is

Answer 24

Depth of water
Height above sea level
Resistance of the suction lift piping

Question 25

Air spurting from a faucet on a pressure system may be caused by

Answer 25

Leaks in the piping

Question 26

The best pump for a booster application is a ____ pump

Answer 26

Centrifugal pump

Question 27

Practical lift of a pump is

Answer 27

15 - 25 ft

Question 28

Which pump is capable of producing the most pressure?
A. Jet
B. Gear
C. Centrifugal
D. Sump

Answer 28

B. Gear

Question 29

Effects of a partially plugged ejector is

Answer 29

High vacuum
Cavitation
Increased pressure drop at the orifice

Question 30

The minimum size supply pipe for a urinal flushometer would be

Answer 30

3/4”

Question 31

A solenoid valve is closed by _____ tension or _____ tension

Answer 31

Spring or hydraulic

Question 32

The name given to a pipe drawing submitted after the job is completed, to show locations of piping on the job is

Answer 32

As-build drawings / redline drawings

Question 33

Water or industrial waste may not enter the drainage system if the discharge temperature is higher than

Answer 33

75 ‘C

Question 34

The control valve on the water supply to a domestic dishwasher would be _____ operated

Answer 34

Electronically

Question 35

The rubber seal on an enamelled steel self-rimming basin is partially removed ____ the basin is clamped in place

Answer 35

After

Question 36

An example of a compression type valve is

Answer 36

A globe valve

Question 37

In a hydronic heating system, this device is used to reduce the override and underride of a thermostat

Answer 37

Anticipator

Question 38

In a hydronic heating system, this control allows a low voltage zone valve to operate a line voltage circuit

Answer 38

End switch

Question 39

How many litres in one imperial gallon?

Answer 39

4.54