Question 1
Under G13/AS2 Table 2, what is the maximum discharge-unit loading for a DN100 drain laid at a gradient of 1:80?
Correct Answer:
149 discharge units
Question 2
A DN150 foul-water drain has a calculated load of 600 discharge units. Under G13/AS2 Table 2, what is the flattest listed gradient that can carry that load?
Correct Answer:
1 in 160
Question 3
A DN100 drain is laid at 1 in 60 over a horizontal run of 30 m. What is the total fall?
Correct Answer:
500 mm
Question 4
The invert of a drain is best described as which part of the pipe?
Correct Answer:
The lowest point of the internal bore
Question 5
Under G13/AS2, how must a non-vent connection enter a foul-water drain?
Correct Answer:
Use ≤45° upstream and point the junction with flow
Question 1
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About this Exam

Prepare with the NZ Certifying Drainlayer Practice Questions - NZ PGDB Certifying Drainlayer Examination Exam practice quiz. This question bank includes 100 questions covering drain, water, foul-water, drainage, and trap. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NZ Certifying Drainlayer Practice Questions - NZ PGDB Certifying Drainlayer Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on drain, water, foul-water, drainage, and trap. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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