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TRADESMAN DRAINLAYER EXAM
PRACTICE BRAND NEW ACTUAL
EXAM WITH 100% VERIFIED
QUESTIONS AND CORRECT
SOLUTIONS
Explain the purpose of a neutralising tap - ANSWER-To treat
corrosive waste before allowing it to be discharged into an
outfall
Give seven examples of industrial locations where a
neutralizing trap would be required - ANSWER-Scientific
laboratories. Photographic laboratories. Printers. Battery plants.
Electroplaters. Tanneries. Hospitals.
A section of drain has begun to regularly block. Give six
possible causes of this. - ANSWER-Tree roots. Penetrations.
Backfall. Collapse. Fats. Foreign object.
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Describe the process that occurs in a septic tank's aerated
chamber - ANSWER-Air introduced into the chamber so that
aerobic bacteria work more efficiently.
Give five factors that contribute to stratification/layering in a
septic tank. - ANSWER-Heavier solids sink while lighter liquids
float. Differing density of components. Input flow rate. Retention
time. Tank volume.
Name the THREE layers or zones that can be found in a septic
tank. - ANSWER-Scum. Liquid. Sludge.
Describe the process of transpiration in relation to an effluent
disposal system. - ANSWER-Plants absorb liquid through the
roots and then the liquid is released through the leaves.
Give four reasons why surface water should not be disposed of
through a septic tank system. - ANSWER-Overloads the tank.
Flushes the sewage through to the effluent system. Flooding
the effluent disposal field. Stirs up layers in the tank.
TRADESMAN DRAINLAYER EXAM
PRACTICE BRAND NEW ACTUAL
EXAM WITH 100% VERIFIED
QUESTIONS AND CORRECT
SOLUTIONS
Explain the purpose of a neutralising tap - ANSWER-To treat
corrosive waste before allowing it to be discharged into an
outfall
Give seven examples of industrial locations where a
neutralizing trap would be required - ANSWER-Scientific
laboratories. Photographic laboratories. Printers. Battery plants.
Electroplaters. Tanneries. Hospitals.
A section of drain has begun to regularly block. Give six
possible causes of this. - ANSWER-Tree roots. Penetrations.
Backfall. Collapse. Fats. Foreign object.
, 2 | Page
Describe the process that occurs in a septic tank's aerated
chamber - ANSWER-Air introduced into the chamber so that
aerobic bacteria work more efficiently.
Give five factors that contribute to stratification/layering in a
septic tank. - ANSWER-Heavier solids sink while lighter liquids
float. Differing density of components. Input flow rate. Retention
time. Tank volume.
Name the THREE layers or zones that can be found in a septic
tank. - ANSWER-Scum. Liquid. Sludge.
Describe the process of transpiration in relation to an effluent
disposal system. - ANSWER-Plants absorb liquid through the
roots and then the liquid is released through the leaves.
Give four reasons why surface water should not be disposed of
through a septic tank system. - ANSWER-Overloads the tank.
Flushes the sewage through to the effluent system. Flooding
the effluent disposal field. Stirs up layers in the tank.
