Review #4 Flashcards
What is the effect when a water line is reduced in size while the rate of flow is maintained?
There will be an increase in velocity and a reduction in pressure
A common cause for loss of seal in a plumbing fixture trap due to siphonage is a clogged ____
Vent pipe
To increase the pressure downstream of a pressure reducing valve, the plumber would turn the adjusting screw ____
Clockwise
To shorten the flush of a “flushometer” valve turn the needle valve on the body of the flush valve ____
Counter clockwise
A direct-acting aquastat will turn a boiler off on a ____ in temperature
Rise
A reverse-acting aquastat will turn the _____ on when the temperature rises
Circulator
The standard rough in from finished floor to the centreline of the waste outlet for a lavatory is
18”
The standard measurement from the centre line of a tank-type toilet to the centre of the water supply is
6”
Where proper grade on a building drain cannot be obtained, the sewer must be designed to provide a minimum flow rate of
2 foot/sec
The maximum length of a water closet arm is
116” (3 m)
The diameter of a stack vent is determined by
It’s developed length and total load
The regenerating agent used in domestic water softeners is
Sodium chloride
When the water level in a hot water heating system drops to an unsafe level, what is used to indicate this?
Low water cutoff
This backflow preventer must not be installed upstream if a shutoff valve
AVB
The minimum differential between the supply pressure and the zone of reduced pressure in an RPBA is ____ psid
2 psid
The length of a vent header is determined by
It’s developed length from open air to the furthest fixture connection
This type of hydronic heating system layout uses one pipe for supply and return as well as special diverter tees
Monoflow
Backflow preventer found on a bidet
AVB
A standard height above finished floor to the drain for a pedestal basin is
21”
Barrier free means
Accessible to the physically challenged
The type of valve most likely to be found directly inside a residential building at the end of a water service is
Compression stop-and-waste
The type of valve used directly inside a commercial building is a
Gate valve or butterfly valve
Vibration in a base mounted pump is likely caused by
Misalignment
A cause of vibration in the suction lift of a pump is
Depth of water
Height above sea level
Resistance of the suction lift piping
Air spurting from a faucet on a pressure system may be caused by
Leaks in the piping
The best pump for a booster application is a ____ pump
Centrifugal pump
Practical lift of a pump is
15 - 25 ft
Which pump is capable of producing the most pressure?
A. Jet
B. Gear
C. Centrifugal
D. Sump
B. Gear
Effects of a partially plugged ejector is
High vacuum
Cavitation
Increased pressure drop at the orifice
The minimum size supply pipe for a urinal flushometer would be
3/4”
A solenoid valve is closed by _____ tension or _____ tension
Spring or hydraulic
The name given to a pipe drawing submitted after the job is completed, to show locations of piping on the job is
As-build drawings / redline drawings
Water or industrial waste may not enter the drainage system if the discharge temperature is higher than
75 ‘C
The control valve on the water supply to a domestic dishwasher would be _____ operated
Electronically
The rubber seal on an enamelled steel self-rimming basin is partially removed ____ the basin is clamped in place
After
An example of a compression type valve is
A globe valve
In a hydronic heating system, this device is used to reduce the override and underride of a thermostat
Anticipator
In a hydronic heating system, this control allows a low voltage zone valve to operate a line voltage circuit
End switch
How many litres in one imperial gallon?
4.54
