WASTEWATER COLLECTIONS LEVEL II
QUESTIONS
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📋 DOCUMENT OVERVIEW 86 Qs
This document, "Wastewater Collections Level II Questions," covers various topics in wastewater
collection systems, specifically focusing on wet well operations, solids management, pump station
performance, water quality indicators, pipe corrosion, electrical safety, and wastewater characteristics.
The document provides 86 questions with correct answers and detailed explanations, serving as a study
resource for students to review and understand key concepts. By utilizing this document, students can
efficiently review and reinforce their knowledge, enhancing their comprehension of wastewater
collection systems and preparing them for exams or professional assessments.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
QUESTION 1
Wet well probe systems are usually used for---- determination(s) of level.
A. Approximate
B. Dual point
C. continuous
D. Single point
CORRECT ANSWER
D. Single point
RATIONALE: Wet well probe systems are typically used to determine the level of water in a wet well, which requires
continuous monitoring to accurately assess the water level. This is because continuous determination allows for real-
time data, enabling operators to quickly respond to changes in water level, such as during pumping operations.
QUESTION 2
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, A foreman's monthly report should include the
A. Last time the supervisor read the report
B. Number of complaints received and investigated
C. number of monthly reports prepared
D. Number if qualifiable worker's available
CORRECT ANSWER
B. Number of complaints received and investigated.
RATIONALE: The correct answer focuses on the importance of tracking and addressing employee complaints, which is a
crucial aspect of maintaining a fair and productive work environment. By including the number of complaints received
and investigated, the foreman's report demonstrates accountability and provides valuable insights for improvement.
QUESTION 3
Solids that settle out in the bottom of a wet well are called
A. scum
B. Colloidal solids
C. suspended solids
D. Settleable solids
CORRECT ANSWER
D. Settleable solids
RATIONALE: The correct answer is "D. Settleable solids" because settleable solids have a larger particle size and mass,
allowing them to settle to the bottom of a wet well due to gravity, whereas suspended solids remain suspended in the
water column. This distinction in particle size and behavior is the key factor in differentiating settleable solids from other
types of solids, such as scum, colloidal solids, and suspended solids.
QUESTION 4
What determines the amount of hydrogen sulfide produced in a sewer?
A. BOD concentration
B. DO concentration
C. pH
D. SS concentration
CORRECT ANSWER
C. pH
RATIONALE: The pH level determines the amount of hydrogen sulfide produced in a sewer because it affects the rate of
sulfate-reducing bacteria's metabolic process, which is responsible for converting sulfate into hydrogen sulfide gas. As
pH levels become more acidic or alkaline, the bacteria's activity and the resulting hydrogen sulfide production are
significantly impacted, making pH a crucial factor in this process.
QUESTION 5
Two pumps of the same capacity operate together with a single main. The discharge will be--- in a
typical pump station.
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, A. the same as one pump
B. more than one pump, but not twice as much
C. twice as much as one pump
D. more than twice as much as one pump
CORRECT ANSWER
B. more than one pump, but not twice as much
RATIONALE: When two pumps operate together, their combined capacity is indeed more than one pump, but not twice
as much, because each pump's performance is affected by the pressure and resistance in the system, leading to a loss
of efficiency and reduced overall discharge rate. This is a common phenomenon known as "pump head" or "system
head," which causes the actual discharge to be less than the sum of the individual pump capacities.
QUESTION 6
Which of the following is an indicator normally used for determination of water pollution?
A. Fungi
B. Stapylococcus
C. Algae
D. Coliforms
CORRECT ANSWER
D. Coliforms
RATIONALE: Coliforms are a type of bacteria that are commonly found in the environment, particularly in soil and water,
and are often used as an indicator of water pollution because their presence typically signifies contamination. This is
because coliforms can thrive in the presence of fecal matter, which is a common source of water pollution, making them
a reliable indicator of water quality.
QUESTION 7
What function does a ground fault circuit interrupter (GFCI) perform when there is an imbalance of
current between the hot and neutral conductors of a circuit?
A. bypass the ground fault
B. grounds the equipment
C. opens the circuit
D. rebalances the current
CORRECT ANSWER
C. Opens the circuit
RATIONALE: A GFCI functions by interrupting the circuit when it detects an imbalance of current between the hot and
neutral conductors, which is typically a sign of a ground fault or electrical shock hazard. By opening the circuit, the GFCI
prevents the flow of electricity and helps to protect individuals from electrical shock, making option C the correct
function.
QUESTION 8
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QUESTIONS
85+ (2026 A+ Graded) Exam-Style Questions | Verified Solutions |
Complete Answer Key
100% Guarantee Pass
📋 DOCUMENT OVERVIEW 86 Qs
This document, "Wastewater Collections Level II Questions," covers various topics in wastewater
collection systems, specifically focusing on wet well operations, solids management, pump station
performance, water quality indicators, pipe corrosion, electrical safety, and wastewater characteristics.
The document provides 86 questions with correct answers and detailed explanations, serving as a study
resource for students to review and understand key concepts. By utilizing this document, students can
efficiently review and reinforce their knowledge, enhancing their comprehension of wastewater
collection systems and preparing them for exams or professional assessments.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
QUESTION 1
Wet well probe systems are usually used for---- determination(s) of level.
A. Approximate
B. Dual point
C. continuous
D. Single point
CORRECT ANSWER
D. Single point
RATIONALE: Wet well probe systems are typically used to determine the level of water in a wet well, which requires
continuous monitoring to accurately assess the water level. This is because continuous determination allows for real-
time data, enabling operators to quickly respond to changes in water level, such as during pumping operations.
QUESTION 2
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, A foreman's monthly report should include the
A. Last time the supervisor read the report
B. Number of complaints received and investigated
C. number of monthly reports prepared
D. Number if qualifiable worker's available
CORRECT ANSWER
B. Number of complaints received and investigated.
RATIONALE: The correct answer focuses on the importance of tracking and addressing employee complaints, which is a
crucial aspect of maintaining a fair and productive work environment. By including the number of complaints received
and investigated, the foreman's report demonstrates accountability and provides valuable insights for improvement.
QUESTION 3
Solids that settle out in the bottom of a wet well are called
A. scum
B. Colloidal solids
C. suspended solids
D. Settleable solids
CORRECT ANSWER
D. Settleable solids
RATIONALE: The correct answer is "D. Settleable solids" because settleable solids have a larger particle size and mass,
allowing them to settle to the bottom of a wet well due to gravity, whereas suspended solids remain suspended in the
water column. This distinction in particle size and behavior is the key factor in differentiating settleable solids from other
types of solids, such as scum, colloidal solids, and suspended solids.
QUESTION 4
What determines the amount of hydrogen sulfide produced in a sewer?
A. BOD concentration
B. DO concentration
C. pH
D. SS concentration
CORRECT ANSWER
C. pH
RATIONALE: The pH level determines the amount of hydrogen sulfide produced in a sewer because it affects the rate of
sulfate-reducing bacteria's metabolic process, which is responsible for converting sulfate into hydrogen sulfide gas. As
pH levels become more acidic or alkaline, the bacteria's activity and the resulting hydrogen sulfide production are
significantly impacted, making pH a crucial factor in this process.
QUESTION 5
Two pumps of the same capacity operate together with a single main. The discharge will be--- in a
typical pump station.
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, A. the same as one pump
B. more than one pump, but not twice as much
C. twice as much as one pump
D. more than twice as much as one pump
CORRECT ANSWER
B. more than one pump, but not twice as much
RATIONALE: When two pumps operate together, their combined capacity is indeed more than one pump, but not twice
as much, because each pump's performance is affected by the pressure and resistance in the system, leading to a loss
of efficiency and reduced overall discharge rate. This is a common phenomenon known as "pump head" or "system
head," which causes the actual discharge to be less than the sum of the individual pump capacities.
QUESTION 6
Which of the following is an indicator normally used for determination of water pollution?
A. Fungi
B. Stapylococcus
C. Algae
D. Coliforms
CORRECT ANSWER
D. Coliforms
RATIONALE: Coliforms are a type of bacteria that are commonly found in the environment, particularly in soil and water,
and are often used as an indicator of water pollution because their presence typically signifies contamination. This is
because coliforms can thrive in the presence of fecal matter, which is a common source of water pollution, making them
a reliable indicator of water quality.
QUESTION 7
What function does a ground fault circuit interrupter (GFCI) perform when there is an imbalance of
current between the hot and neutral conductors of a circuit?
A. bypass the ground fault
B. grounds the equipment
C. opens the circuit
D. rebalances the current
CORRECT ANSWER
C. Opens the circuit
RATIONALE: A GFCI functions by interrupting the circuit when it detects an imbalance of current between the hot and
neutral conductors, which is typically a sign of a ground fault or electrical shock hazard. By opening the circuit, the GFCI
prevents the flow of electricity and helps to protect individuals from electrical shock, making option C the correct
function.
QUESTION 8
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