WorksheetsTrap Seal Quiz
Total questions: 31
Worksheet time: 16mins
What happens if the trap seal is lost?
The water level rises above the trap
The property becomes flooded
Noxious smell enters the property
The trap becomes blocked
What is one reason for trap seal loss?
Water level rises above the trap
Water level is lowered below the bend of the trap
The trap is removed
The trap is cleaned
What is a common reason for trap seal loss?
The seal water is leaking out.
The trap is too large.
The water pressure is too high.
The trap is made of metal.
What could cause the seal water to leak out in a trap?
Rubber seals not being watertight.
Excessive water flow.
High temperature.
Metal corrosion.
What is another possible reason for trap seal loss besides rubber seals not being watertight?
The plastic body of the trap being damaged.
The trap being too old.
The trap being too small.
The trap being too clean.
What is a common reason for trap seal loss in warmer climates and holiday properties?
Evaporation
Condensation
Freezing
Overflow
What happens to the water in the trap seal due to lack of use?
It evaporates
It freezes
It overflows
It condenses
How is the seal water in appliances maintained?
By regular use
By adding chemicals
By heating
By cooling
What causes the phenomenon known as "Wavering out" in trap seal loss?
Wind passing over the top of a soil stack
Water pressure increase
Temperature changes
Soil erosion
What can assist in preventing the loss of water from the seal due to wavering out?
Wind cowl
Water pump
Heat exchanger
Soil filter
What causes trap seal loss due to momentum?
A slow trickle of water
A large amount of water suddenly discharged
A small amount of water slowly discharged
No water movement
What happens when a WC is discharged from the first floor with a tight radius at the base of the soil stack?
The water flows smoothly without any issues.
The water starts to back up the stack, causing pressure to build.
The water evaporates before reaching the base.
The water is absorbed by the soil stack.
What generally causes capillary action in S traps?
Long fibres or hairs caught over the top of the weir
High water pressure
Low water temperature
Excessive water flow
What is self-siphonage in plumbing?
It occurs when a single appliance discharges and pulls its own trap out.
It is the process of water flowing uphill in a pipe.
It is a method to increase water pressure in pipes.
It is a technique to clean pipes using high pressure.
What is a common cause of self-siphonage in basins?
Large waste pipe diameter
Small waste pipe diameter
High water temperature
Low water pressure
What is the easiest way to overcome self-siphonage?
Increase the water temperature
Use an anti-vac trap
Decrease the water pressure
Use a larger waste pipe
When does self-siphonage also occur?
When the waste pipe is too short
When the waste pipe is too steep
When the waste pipe is too wide
When the waste pipe is too narrow
What is the term used to describe the loss of water seal in plumbing traps due to pressure differences?
Backflow
Self-siphonage
Airlock
Water hammer
What is induced siphonage?
A process where water is pushed back into the appliance.
A situation where water is heated to a high temperature.
A condition where water is pulled from one appliance's trap due to another appliance's discharge.
A method of increasing water pressure in pipes.
What happens when a plug of water moves down the waste pipe?
It creates a positive pressure.
It creates a negative pressure.
It increases the water temperature.
It stops the water flow.
What is the recommended branch discharge pipe diameter for multiple appliances?
25mm
50mm
75mm
100mm
What is the term used to describe the loss of water in a plumbing trap due to pressure differences?
Induced siphonage
Capillary action
Evaporation
Condensation
What is the term used to describe the loss of water in a plumbing trap due to siphonage?
Induced siphonage
Capillary action
Evaporation
Backflow
What is the required size of the waste pipe before entering the soil stack to prevent induced siphonage?
32mm
40mm
50mm
60mm
What is a common cause of trap seal loss?
Waste pipes are too short
Waste pipe diameter is too large
Incorrect fall
No changes in direction
Which of the following is NOT a common cause of trap seal loss?
Waste pipes are too long
Waste pipe diameter is too small
Correct fall
Debris or blockages
How can too many appliances on a discharge branch affect trap seal?
It prevents trap seal loss
It causes trap seal loss
It has no effect on trap seal
It improves water flow
What is the maximum length of the waste pipe for a WC appliance?
6.0 m
1.7 m
3.0 m
2.5 m
What is the gradient range for a basin or bidet waste pipe?
18-22 mm/m
18-90 mm/m
18 mm/m
20-25 mm/m
Which appliance has a waste size of 32 mm?
Basin or bidet
WC
Washing machine/dishwasher
Bath
What is the trap seal depth for a sink?
75 mm
50 mm
60 mm
80 mm
