Which type of well is created by driving a small-diameter pipe with a hardened drive point and screen into unconsolidated material?
Well Types
Question · Easy
Your heart has these. So do pipes.
Short
An aquifer that is bounded above and below by impermeable layers and is under pressure is called what?
Which well type is MOST susceptible to surface contamination and seasonal water-level fluctuation?
Question · Medium
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The water table is BEST defined as which of the following?
A drilled residential well in stable bedrock typically reaches what depth range compared with a dug well?
In an unconfined aquifer, the static water level in a well will be at what elevation?
Which feature distinguishes a flowing artesian well from a non-flowing artesian well?
Question · Hard
Recharge to an unconfined aquifer occurs PRIMARILY by which mechanism?
Driven wells are typically limited to what maximum depth range due to construction method?
A confining layer above an aquifer is typically composed of which material?
Why is a deep drilled well in a confined aquifer generally safer for drinking water than a shallow dug well?
Which terms describes the depth at which the soil and rock become fully saturated with groundwater in an unconfined system?
A perched water table forms when which condition is present?
Which of the following is the MOST reliable indicator that a residential well likely draws from a confined aquifer?
What is the primary purpose of the well casing?
Components
Common materials for residential well casing include all of the following EXCEPT:
The annular space between the well casing and the bore wall must be filled with what material to prevent surface contamination?
What is the function of a well screen?
A pitless adapter performs which essential function in a well system?
An InterNACHI well inspector observes a well cap that is loose-fitting and lacks an insect-proof screened vent. What is the correct call?
Per typical well construction standards, how far above finished grade should the well casing extend?
A 'sanitary seal' on a well refers to which element?
Why must a residential well have a screened vent in the well cap?
In a freeze-prone climate, the pitless adapter must be installed where relative to the frost line?
Which casing material is MOST susceptible to internal corrosion that can release iron and reduce yield?
A filter pack (gravel pack) around the well screen serves what purpose?
Which observation at the wellhead is a sanitary defect that an InterNACHI inspector should report?
An older well shows a 4-inch casing terminated flush with a concrete slab and capped with a screw-on metal lid that lacks a gasket. The inspector should describe this as:
A shallow-well jet pump is generally limited to drawing water from depths no greater than approximately:
Pumps
Submersible well pumps are installed where?
What is the cut-in / cut-out pressure for the MOST common residential well pressure switch in the United States?
In a standard pressure-tank system with a 30/50 psi switch, the pump turns ON at what pressure?
The pre-charge air pressure of a bladder/diaphragm pressure tank should typically be set how relative to the pump's cut-in pressure?
Drawdown of a pressure tank refers to which quantity?
Symptoms of a waterlogged (loss of pre-charge) pressure tank include:
Which protection device is required for a submersible well pump motor to prevent damage if the well runs dry?
A check valve in a well system performs what function?
A deep-well jet pump differs from a shallow-well jet pump in that it:
Which pump arrangement is MOST efficient and quietest for a 250-ft drilled well serving a single-family home?
A 'constant-pressure' (variable-frequency drive) well system primarily improves which aspect of well performance?
Frequent pump short-cycling on every faucet use most likely indicates which problem?
Which symptom suggests a failed (stuck-closed) check valve at the pump?
Tank drawdown gallons depends on which of the following?
A pressure gauge mounted at the pressure tank reads 0 psi and remains 0 even though the pump runs. The MOST likely cause is:
The EPA Maximum Contaminant Level (MCL) for nitrate in drinking water is:
Water Quality
Total coliform bacteria in drinking water indicate which condition?
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