Water Distribution Practice Test Questions And Answers
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Check out these water distribution practice test questions and answer them accordingly. In this scored quiz, you'll be asked 20 questions related to the water distribution system. This is a standardized practice test on the topic of the water distribution system for the students. So, if you think you know about this topic and can score well on this test, you should play the quiz.
Each question not only tests your knowledge but also provides insightful explanations that highlight important concepts and practical applications. Whether you ace the quiz or learn from the answers, you'll gain valuable insights into the Read moreessential life-sustaining resource that is water.
Gear up to dive into the world of water distribution. Test your knowledge, challenge your friends, and learn something new with our Water Distribution Quiz. Start now and make a splash with your newfound expertise!
Water Distribution Questions and Answers
- 1.
Usually, which type of hydrant is a flush hydrant?
- A.
Warm-climate hydrant
- B.
Wet-barrel hydrant
- C.
Dry-barrel hydrant
- D.
Standpipe-barrel hydrant
Correct Answer
B. Wet-barrel hydrantExplanation
A flush hydrant is typically a wet-barrel hydrant. In wet-barrel hydrants, the main valve is constantly in contact with water. When the hydrant is opened, water flows immediately from the barrel, which is partially filled with water. This design is common in areas where freezing temperatures are not a concern, such as warmer climates.Rate this question:
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- 2.
Which type of temperature sensor uses two wires of different materials?
- A.
Thermistors
- B.
Thermo-resistors
- C.
Thermocouples
- D.
Thermo-conductors
Correct Answer
C. ThermocouplesExplanation
Thermocouples are temperature sensors that use two wires made of different materials. When there is a temperature difference between the junctions of the wires, it creates a voltage that is proportional to the temperature. This voltage is then measured and converted into a temperature reading. Thermocouples are commonly used in various industries due to their wide temperature range, durability, and accuracy.Rate this question:
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- 3.
The amount of energy in feet that a pump supplies to a fluid is called
- A.
Velocity head
- B.
Pump head
- C.
Total head
- D.
Pressure head
Correct Answer
B. Pump headExplanation
The term "pump head" refers to the amount of energy that a pump supplies to a fluid. It represents the pressure that the pump can generate to move the fluid. The pump head is typically measured in units of feet, indicating the height that the pump can lift the fluid. This term is commonly used in fluid mechanics to describe the performance and capabilities of a pump.Rate this question:
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- 4.
Which is the most frequent cause of hydraulic transients in water distribution systems?
- A.
Controlled pump shutdown
- B.
Flow demand changes
- C.
Pump startup
- D.
Valve opening and closing
Correct Answer
D. Valve opening and closingExplanation
Valve opening and closing is the most frequent cause of hydraulic transients in water distribution systems. When a valve is opened or closed abruptly, it can create sudden changes in pressure and flow within the system. These rapid changes in pressure can cause water hammer, which is a type of hydraulic transient characterized by high-pressure surges and vibrations. Therefore, valve operations should be carefully controlled and executed to minimize the occurrence of hydraulic transients.Rate this question:
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- 5.
Which type of valve should be used for filling an elevated tank if the full system pressure overflows the tank?
- A.
Pressure-relief valve
- B.
Altitude valve
- C.
Pressure-reducing valve
- D.
Globe valve
Correct Answer
B. Altitude valveExplanation
An altitude valve should be used for filling an elevated tank if the full system pressure overflows the tank. An altitude valve is designed to control the level of water in a tank by automatically opening and closing based on the water level. It is specifically designed for use in elevated tanks to prevent overflows by shutting off the water supply when the tank reaches a certain level. This ensures that the tank does not become overfilled and helps maintain the desired water level. A pressure-relief valve, pressure-reducing valve, and globe valve are not suitable for this purpose.Rate this question:
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- 6.
One form of a differential-pressure flow meter is a(n)
- A.
Propeller
- B.
Proportional
- C.
Velocity-type
- D.
Orifice plate
Correct Answer
D. Orifice plateExplanation
An orifice plate is a type of differential-pressure flow meter. It consists of a thin plate with a hole in the center, which is inserted into a pipe. As fluid flows through the pipe, the pressure difference created by the restriction caused by the orifice plate is measured. This pressure difference is directly proportional to the flow rate of the fluid. Therefore, the orifice plate is an effective tool for measuring flow rate in various industries, such as oil and gas, water treatment, and chemical processing.Rate this question:
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- 7.
If a centrifugal pump with a single volute is operated at more than______ of its design capacity, an excess radial load will result, causing premature bearing failure.
- A.
110%
- B.
120%
- C.
125%
- D.
135%
Correct Answer
B. 120%Explanation
When a centrifugal pump with a single volute operates at more than 120% of its design capacity, it creates an excess radial load. This excessive load puts strain on the bearings, causing them to fail prematurely. Therefore, operating the pump at this capacity can lead to bearing failure and potential damage to the pump.Rate this question:
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- 8.
How many inches of mercury is a total vacuum at sea level?
- A.
14.7 inches
- B.
30.0 inches
- C.
34.0 inches
- D.
39.6 inches
Correct Answer
B. 30.0 inchesExplanation
A total vacuum at sea level is equivalent to 30.0 inches of mercury. This is because inches of mercury is a unit of measurement used to describe atmospheric pressure, and a total vacuum represents the complete absence of atmospheric pressure. Therefore, the correct answer is 30.0 inches.Rate this question:
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- 9.
How many feet of water will equal the atmospheric pressure at sea level?
- A.
28ft
- B.
30ft
- C.
32ft
- D.
34ft
Correct Answer
D. 34ftExplanation
Atmospheric pressure at sea level is typically measured as 14.7 pounds per square inch (psi). This pressure is equivalent to a column of water that is 34 feet high, as water exerts a pressure of 0.433 psi per foot of depth. Therefore, 34 feet of water would equal the atmospheric pressure at sea level.Rate this question:
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- 10.
Pressure gauges connected to both the suction and discharge sides of a pump should be connected.
- A.
2 to 3 feet on either side of a pump, unless there is a change in direction, it can go closer.
- B.
1 foot and 2 feet from the pump on the suction side and discharge side, respectively.
- C.
Next to the pump on the suction side and just before the check valve on the discharge valve.
- D.
To the pressure taps supplied on the pump.
Correct Answer
D. To the pressure taps supplied on the pump.Explanation
Pressure gauges should be connected to the pressure taps supplied on the pump. This ensures accurate measurement of the pressure on both the suction and discharge sides of the pump. Connecting the gauges directly to the pressure taps allows for direct and immediate measurement of the pressure, providing real-time information about the pump's performance.Rate this question:
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- 11.
Which are the two principal types of throttling valves?
- A.
Throttling and pressure-reducing valves
- B.
Butterfly and relief valves
- C.
Butterfly and altitude valves
- D.
Pressure-reducing and altitude valves
Correct Answer
A. Throttling and pressure-reducing valvesExplanation
The two principal types of throttling valves are: Throttling Valves and Pressure-Reducing Valves. Throttling Valves are designed to control the flow rate or pressure of a fluid by gradually reducing the opening through which the fluid passes. They are commonly used to regulate flow in pipelines, HVAC systems, and various industrial processes. Pressure-reducing valves, also known as pressure control valves, are designed to maintain a specific downstream pressure by reducing the incoming pressure from the source. They are often used to control the pressure of gases or liquids in a system.Rate this question:
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- 12.
Which valve would be best to use to precisely throttle flow?
- A.
Globe valve
- B.
Butterfly valve
- C.
Rotary valve
- D.
Needle valve
Correct Answer
D. Needle valveExplanation
A needle valve would be the best choice to precisely throttle flow because it allows for fine control of the flow rate. The needle-shaped plunger inside the valve can be adjusted to increase or decrease the flow by partially obstructing the passage. This design provides accurate and gradual flow regulation, making it ideal for applications that require precise control, such as in laboratories or industries where small adjustments in flow rate are crucial.Rate this question:
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- 13.
SCAD A systems consist of the following distinct components:
- A.
Remote terminal units (RTUs), communications, and human-machine interface (HMI)
- B.
Sensing instrument, RTUs, communications, and HMI
- C.
Sensing instrument, RTUs, communications, master station, and HMI
- D.
RTUs, communications, master station, and HMI
Correct Answer
D. RTUs, communications, master station, and HMIExplanation
The correct answer is RTUs, communications, master station, and HMI. This answer is correct because SCADA systems typically consist of these four components. RTUs (Remote Terminal Units) are responsible for collecting data from sensors and sending it to the master station. Communications refer to the network infrastructure that allows data transmission between the RTUs, master station, and other components. The master station is the central control unit that receives and processes data from the RTUs, and the HMI (Human-Machine Interface) is the user interface that allows operators to monitor and control the system.Rate this question:
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- 14.
Stray-current corrosion is caused by
- A.
Corrosive soils
- B.
Acidic soils
- C.
AC currents
- D.
DC currents
Correct Answer
D. DC currentsExplanation
Stray-current corrosion occurs when direct current (DC) flows through a metal structure in contact with the ground. The DC current causes a chemical reaction that leads to corrosion of the metal. This type of corrosion is not caused by corrosive or acidic soils, but rather by the presence of DC currents.Rate this question:
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- 15.
When a metal is galvanized, it is coated with
- A.
Zinc
- B.
Aluminum
- C.
Aluminum oxide
- D.
Aluminum hydroxide
Correct Answer
A. ZincExplanation
When a metal is galvanized, it is coated with zinc. Galvanization is a process used to protect metals from corrosion by applying a layer of zinc to the surface. Zinc is chosen for this purpose because it has excellent corrosion resistance properties. It forms a protective barrier on the metal surface, preventing the underlying metal from being exposed to moisture and oxygen, which are the main causes of corrosion. Zinc also acts as a sacrificial anode, meaning it corrodes preferentially over the underlying metal, further enhancing the protection. Therefore, zinc is the correct answer for the coating used in galvanization.Rate this question:
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- 16.
Which system would provide for a "soft start" to a motor?
- A.
Wound-rotor induction motor and a controller
- B.
Synchronous motor and a variable frequency controller
- C.
A variable frequency drive and a squirrel-cage induction motor
- D.
Squirrel-cage induction drive and a variable frequency drive
Correct Answer
A. Wound-rotor induction motor and a controllerExplanation
A wound-rotor induction motor and a controller would provide for a "soft start" to a motor. This is because a wound-rotor induction motor has adjustable resistance in its rotor circuit, allowing for a smooth and gradual increase in the motor's speed during startup. The controller further regulates the motor's starting current and speed, ensuring a controlled and gentle acceleration.Rate this question:
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- 17.
Which type of relay is frequently used to detect power loss and initiate a switchover to another power source?
- A.
Loss-of-phase relays
- B.
Voltage relays
- C.
Frequency relays
- D.
Circuit breaker relays
Correct Answer
B. Voltage relaysExplanation
Voltage relays are frequently used to detect power loss and initiate a switchover to another power source. These relays monitor the voltage level and can detect when there is a significant drop or loss of voltage, indicating a power failure. Once the voltage drops below a certain threshold, the voltage relay triggers a switch to another power source, ensuring a continuous power supply. This makes voltage relays an essential component in backup power systems and critical applications where uninterrupted power is crucial.Rate this question:
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- 18.
When a control switch operated by pressure changes is located too close to a pump station, erratic operation can occur. This problem is known as
- A.
Pulsing
- B.
Seesaw arching
- C.
Racking
- D.
Roaming
Correct Answer
C. RackingExplanation
When a control switch operated by pressure is located too close to a pump station, it can cause erratic operation. This is because the pressure changes near the pump station can affect the switch, causing it to move or vibrate unpredictably. This problem is known as "racking".Rate this question:
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- 19.
Which chemical may cause the leaching of lead in stagnant waters?
- A.
Sodium zinc phosphate
- B.
Lime
- C.
Sodium carbonate
- D.
Sodium hydroxide
Correct Answer
A. Sodium zinc phosphateExplanation
Sodium zinc phosphate may cause the leaching of lead in stagnant waters because it is a compound that contains both sodium and zinc. Both sodium and zinc have the potential to interact with lead, causing it to dissolve and leach into the water. The presence of phosphate in the compound may also contribute to the leaching process.Rate this question:
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- 20.
High levels of cadmium at the customer's tap would most likely be due to
- A.
Copper pipe
- B.
Galvanized pipe
- C.
Iron pipe
- D.
Household fixtures
Correct Answer
B. Galvanized pipeExplanation
Galvanized pipe is the most likely cause of high levels of cadmium at the customer's tap. Galvanized pipes are coated with a layer of zinc, and over time, this coating can corrode, exposing the underlying metal to the water flowing through the pipes. Cadmium can be present in the zinc coating, and when the coating deteriorates, it can leach into the water, resulting in high levels of cadmium at the tap. Copper pipe, iron pipe, and household fixtures are not typically associated with cadmium contamination.Rate this question:
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Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Apr 10, 2024Quiz Edited by
ProProfs Editorial Team -
Jan 31, 2022Quiz Created by
Catherine Halcomb
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