Tradesman Drainlayer Exam Practice Questions With
Complete Solutions
A petrol driven pump is to be used to dewater a trench. Give
four precautions that need to be taken to safeguard workers.
Correct Answers Discharge exhaust fumes away from the
trench. Shore the trench to prevent collapse. Wear hearing
protection equipment to minimise the noise from the pump.
Keep away from the trench to minimise vibration.
A section of drain acting as a vent must not be smaller than what
size? Correct Answers 65 mm
A section of drain has begun to regularly block. Give six
possible causes of this. Correct Answers Tree roots.
Penetrations. Backfall. Collapse. Fats. Foreign object.
A trench is to be excavated to a depth of 1.5 metres. When
would the excavation become classified as particular hazardous
work? Correct Answers When the trench is 1.0 metre wide.
A trench is to be excavated. The trench is deeper than 1.5 m and
its depth is greater than its width at the top. Which of the
following organisations must be notified before starting the
excavation? Correct Answers WorkSafe
According to AS/NZS 3500 Part 2: Sanitary plumbing and
drainage, what is the minimum height an overflow relief gully
trap grate is permitted to be installed above unpaved ground
level? Correct Answers 75 mm
, According to AS/NZS 3500, what is the maximum distance
allowed between anchor blocks installed on an inclined drain?
Correct Answers 3 m
According to the New Zealand Building Code clause G13/AS2
Foul Water, verifiable levelling devices must be used to ensure
uniform gradients of drains laid at gradients in what range?
Correct Answers 1 in 80 or less
According to the New Zealand Building Code clause G13/AS2
Foul Water, what is the minimum diameter for a main drain vent
is? Correct Answers 80 mm
Anchor blocks are to be installed on a drain. State the TWO
conditions that must be met with regard to where on the drain
the anchor blocks must be located. Correct Answers At the top
and bottom. At intervals not exceeding 3 m.
At what length does a branch drain require a vent when it is
being installed in order to comply with New Zealand Building
Code clause G13/AS2 Foul Water? Correct Answers 10.000 m
Complete the table below by giving THREE factors that could
cause the condition of an excavation to deteriorate, and for each
factor give an effect on the excavation. Correct Answers
Slumping/flooding (rain/surface water). Crumbling (drying
wind). Collapse (vibration from traffic/machinery/earthquake).
Slumping/collapse/crumbling (dewatering)
Describe FOUR items of safety equipment in addition to
personal protection equipment that may be required in a
Complete Solutions
A petrol driven pump is to be used to dewater a trench. Give
four precautions that need to be taken to safeguard workers.
Correct Answers Discharge exhaust fumes away from the
trench. Shore the trench to prevent collapse. Wear hearing
protection equipment to minimise the noise from the pump.
Keep away from the trench to minimise vibration.
A section of drain acting as a vent must not be smaller than what
size? Correct Answers 65 mm
A section of drain has begun to regularly block. Give six
possible causes of this. Correct Answers Tree roots.
Penetrations. Backfall. Collapse. Fats. Foreign object.
A trench is to be excavated to a depth of 1.5 metres. When
would the excavation become classified as particular hazardous
work? Correct Answers When the trench is 1.0 metre wide.
A trench is to be excavated. The trench is deeper than 1.5 m and
its depth is greater than its width at the top. Which of the
following organisations must be notified before starting the
excavation? Correct Answers WorkSafe
According to AS/NZS 3500 Part 2: Sanitary plumbing and
drainage, what is the minimum height an overflow relief gully
trap grate is permitted to be installed above unpaved ground
level? Correct Answers 75 mm
, According to AS/NZS 3500, what is the maximum distance
allowed between anchor blocks installed on an inclined drain?
Correct Answers 3 m
According to the New Zealand Building Code clause G13/AS2
Foul Water, verifiable levelling devices must be used to ensure
uniform gradients of drains laid at gradients in what range?
Correct Answers 1 in 80 or less
According to the New Zealand Building Code clause G13/AS2
Foul Water, what is the minimum diameter for a main drain vent
is? Correct Answers 80 mm
Anchor blocks are to be installed on a drain. State the TWO
conditions that must be met with regard to where on the drain
the anchor blocks must be located. Correct Answers At the top
and bottom. At intervals not exceeding 3 m.
At what length does a branch drain require a vent when it is
being installed in order to comply with New Zealand Building
Code clause G13/AS2 Foul Water? Correct Answers 10.000 m
Complete the table below by giving THREE factors that could
cause the condition of an excavation to deteriorate, and for each
factor give an effect on the excavation. Correct Answers
Slumping/flooding (rain/surface water). Crumbling (drying
wind). Collapse (vibration from traffic/machinery/earthquake).
Slumping/collapse/crumbling (dewatering)
Describe FOUR items of safety equipment in addition to
personal protection equipment that may be required in a
