Wastewater collections Grade 1 Exam
Questions with Answers
When should atmospheric monitoring in a confined space be performed? - ✔✔Continuously
from pre-entry to exit
Below what maximum percentage is an atmosphere considered oxygen deficient? - ✔✔19.5%
Which type of pipe is recommended when crossing another underground utility? - ✔✔Ductile
Iron pipe
Which chemical may be used to remove sulfides by precipitation? - ✔✔Ferric Chloride (FeCl3)
What is a Hydro-brake? - ✔✔A vortex flow regulator
What is the purpose of LAMPING a new collection system? - ✔✔Test for obstructions and
straightness
How can most failures of a lift station be prevented? - ✔✔Proper preventative maintenance
What info does a station book provide? - ✔✔ID Numbers and maps of stations
Which pieces of equipment would be expected in a DRY WELL? - ✔✔Electric controls, motors,
pumps (NOT FLOATS)
What piece of equipment is used to prevent the discharged wastewater from flowing back into
the wet well when the pump shuts off? - ✔✔Swing check valve
, Which piece of equipment is used to aid he testing for insulation resistance in a submersible
pump motor? - ✔✔Megger
What are the major reasons for a motor failure? - ✔✔Overloading, voltage imbalance, short
cycling
What is OLFACTORY FATIGUE? - ✔✔Loss of smell
What instrument do you use to measure the pressure head in a pipe, tank, or soil? -
✔✔Piezometer
What items should be listed on a Service Line Location Card? - ✔✔Location of a tap. Pipe size.
Type of pipe. Cleanout location.
What are indicators of a blockage in a sewer system? - ✔✔Overflowing manholes. septic
wastewater. Flooded basements and buildings.
What does SCOURING VELOCITY refer to? - ✔✔the flow required to prevent the deposition and
buildup of solids
Describe a FLEXIBLE pipe. - ✔✔A flexible pipe will bend or bulge from its usual shape when
subjected to a load without being adequately supported. however it will not crack under most
loads and will return nearly to its original shape.
Describe a RIGID pipe. - ✔✔A rigid pipe requires less support but will crack a load causes stress
that exceeds the strength of the pipe.
What makes the PIPE-JOINTS one of the most critical components of the piping system in
sanitary sewer systems? - ✔✔Because of the need to control groundwater infiltration,
wastewater exfiltration, and root intrusion
Questions with Answers
When should atmospheric monitoring in a confined space be performed? - ✔✔Continuously
from pre-entry to exit
Below what maximum percentage is an atmosphere considered oxygen deficient? - ✔✔19.5%
Which type of pipe is recommended when crossing another underground utility? - ✔✔Ductile
Iron pipe
Which chemical may be used to remove sulfides by precipitation? - ✔✔Ferric Chloride (FeCl3)
What is a Hydro-brake? - ✔✔A vortex flow regulator
What is the purpose of LAMPING a new collection system? - ✔✔Test for obstructions and
straightness
How can most failures of a lift station be prevented? - ✔✔Proper preventative maintenance
What info does a station book provide? - ✔✔ID Numbers and maps of stations
Which pieces of equipment would be expected in a DRY WELL? - ✔✔Electric controls, motors,
pumps (NOT FLOATS)
What piece of equipment is used to prevent the discharged wastewater from flowing back into
the wet well when the pump shuts off? - ✔✔Swing check valve
, Which piece of equipment is used to aid he testing for insulation resistance in a submersible
pump motor? - ✔✔Megger
What are the major reasons for a motor failure? - ✔✔Overloading, voltage imbalance, short
cycling
What is OLFACTORY FATIGUE? - ✔✔Loss of smell
What instrument do you use to measure the pressure head in a pipe, tank, or soil? -
✔✔Piezometer
What items should be listed on a Service Line Location Card? - ✔✔Location of a tap. Pipe size.
Type of pipe. Cleanout location.
What are indicators of a blockage in a sewer system? - ✔✔Overflowing manholes. septic
wastewater. Flooded basements and buildings.
What does SCOURING VELOCITY refer to? - ✔✔the flow required to prevent the deposition and
buildup of solids
Describe a FLEXIBLE pipe. - ✔✔A flexible pipe will bend or bulge from its usual shape when
subjected to a load without being adequately supported. however it will not crack under most
loads and will return nearly to its original shape.
Describe a RIGID pipe. - ✔✔A rigid pipe requires less support but will crack a load causes stress
that exceeds the strength of the pipe.
What makes the PIPE-JOINTS one of the most critical components of the piping system in
sanitary sewer systems? - ✔✔Because of the need to control groundwater infiltration,
wastewater exfiltration, and root intrusion
