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CWEA ELECTRICAL AND INSTRUMENT
UPDATED SCRIPT 2026 PRACTICE
SOLUTIONS GRADED A+
โ Parshall Flume Measurement point? 1.2 FT Water Height 20.8xH at measurement point Answer: Possible answer:72,607 MGD โ Absoulte Pressure Gauge? What is True? Answer: Possible answer: Read more accurate or 14.7 PSI higher โ Flow meter that uses electrodes is? Answer: Magnetic Flow Meters โ What is the resister color code : Orange, White,Silver,Gold Band Answer: .39 Ohms โ Pitot tube measures? Answer: Measures Fluid or Gas Velocity โ Chlorine Analyzer reads lower ever time but grab sample shows level are good. What do troubleshoot first? Answer: Buffer โ How to complete a work order when asked to maintain a pump? Answer: Notify Operation, purchase parts, maintain, test, notify complete
โ What shunt resister rating to make 1-5V change on 4-20ma signal? Answer: 250 ohms โ HMI Screen down at the pump station, what to do? Answer: Ask operator to monitor while you troubleshoot and try to fix โ Where does the fluid enter in a Rotameter? Answer: Bottom โ RPM on 4 pole 60 Hz motor Answer: 1800 RPM โ For every 10 Celsius change in operating temp. What happen to motor wire insulation? Answer: Degrades 50% โ What is it called when teaching someone Electrical Task Training? Answer: Safety Task Training โ Personnel injured when working around machines/equipment depending what they do. Based on this: What two classification? Answer: Authorized-Affected โ Resistors wired in parallel on battery 5 ohms, 10 ohms, and 20 ohms. what must be the voltage to force 2.4 amp? Answer: 6.84 V
โ Molder Case Breaker? Answer: Short circuit or Overload โ Nema Enclosure differences? Answer: Weather proof โ How do you make a conveyor belt go faster and a VFD slower? Answer: Increase pulley on the conveyor side and decrease pulley on VFD side โ On a a circuit motor starter there are two start switches. Where does the second starter switch wired? Answer: Parallel with coil โ Commonly used instead of fuses in industrial power distribution systems are: Answer: Circuit Breakers โ What is NEC Article for Solar Panel photovoltaic Answer: ARTICLE 690 SOLAR PHOTOVOLTAIC (PV) SYSTEMS โ On 3 phase power what is the minimum numbers of wire you can use? Answer: 3 wires โ If Level is 5.75 ft and wetwell is 20 feet what is the milliamp? Answer: 5.75/20 X 16 +4 === 8.71 ma
โ What is Reluctance? Answer: magnetic material Its the ability to oppose the flow of magnetic flow flux created by the field window โ What is the property of a coil of wire that opposes any change in the current in the coil? Answer: Inductance โ What is PPE Category 1? Answer: Requiring a single layer of arc- rated PPE, workers need the following clothing: Required Clothing: Long Sleeve Shirt (or Jacket) and Pants or AR Coverall with minimum arc rating of 4 cal/cm. โ Is the Oxygen Safe Zone at 22% Safe? Answer: Yes, between 19.5% to 23.5% โ L.O.T.O. Answer: Lock out tag out is an osha regulation. โ The voltage from phase to ground in a 480v transformer is? Answer: 277 volts. โ What is the main electrical danger when using power tools? Answer: A short circuit โ Shielding protects an analog meter from? Answer: Stray magnetic fields.
โ What happens when a motor loses one phase out of 3? Answer: Single phasing will cause the motor to trip the overload heaters โ What instrument do you use to measure 4-20 mA? Answer: DC clamp meter โ How do you connect an ammeter to check an electrical circuit? Answer: In series with the load. โ If you are angry or impatient with one worker you should? Answer: Avoid transferring that feeling to others. โ First step in troubleshooting a programmable logic controller(PLC) system is? Answer: Know the process โ Which of the following actions should be taken before working on controls that may disrupt plant operations? Answer: Have an operator present. โ Which of the following best describes the efficiency of preventive maintenance for plant equipment? Answer: Periodic inspection of facilities to discover developing defects that could lead to equipment failure. โ In a 240v-120v Delta system, the high leg is? Answer: 208v
โ What class and division above water on a primary clarifier? Answer: Class 1 Division 2 โ AC reads out how? Answer: Peak to peak. โ What do you use to clean Electrical instruments? Answer: For Electro- pnuematic Positioners you use solvent. โ Where are the overloads installed on a wire diagram? Answer: Before circuit protection, in series with the line leads. โ Arc-rated clothing is rated? Answer: Cal/Cm โ Whats the maximum ampacity on #12 rated wires THWN?(Thermoplastic Heat and Water-resistant Nylon-coated) Answer: 20 amps. โ On a 480v 3 phase wye, the nuetral and line phase are? Answer: he same times the square root of 3 (1.73)=480. (Comes to 277v)
โ How far from the disconnect should a pump be located? Answer: located within sight from and not at a distance greater than 15 m (50 ft) from the motor and equipment. โ The most important requirement for good maintenance of motor starters is: Answer: proper lubrication โ A reversing starter reverses a three-phase motor by interchanging: Answer: two of the line leads โ What kind of protection is provided in a manual across-the-line three- phase motor control? Answer: Overload protection only โ The drawing that provides a view of the entire system in process control is the: Answer: P&ID drawing โ The most commonly used type of diagram in process control is: Answer: piping and instrument drawing โ When Taking a flow measurement the measuring device is performing what type of calculation? Answer: Root mean square
โ A 480V, 3 phase motor, Delta connected, has one leg shorted, what will the resistance be compared to the other legs Answer: A. Greater B. Lower C. Same D. Greater or lower โ A 12V battery rated to provide 1amp for 20 hours across a 2000w load. How long will the battery continue to produce an output? Answer: A. 1 hour B. 10 hour C.** 100 hour D. 1000 hour โ A tank is 30' high, 26' wide, filled 14'. What is the volume? I believe you should assume this tank is a cylinder. Pay attention if the question ask for the tanks volume or the volume of the fluid inside the tank. Answer: Do Calculations โ A 36" pipe has an elevation gain of 300', the process reaches an elevation of 200'. What is the PSI? Answer: Do Calculation โ A pipe has a 10" opening , and produces 2500 GPM. How many cubic feet/sec? Answer: Do Calculations
โ Redlines should be used to? Answer: Check the engineer โ Best way to check a 4-20ma signal? Answer: Place DMM selector to mA and put leads in series with the circuit. โ What is the most important step when performing a megger test? Answer: Put the leads together and verify a direct short โ A diaphragm type gauge protector is used in which type of environment? Answer: Corrosive โ You are the lead on a high priority critical pump repair. Your co- worker decides it's a good time to take a break. You know that the job will take ten minutes if you have their help. What should you do? Answer: A. Do the job yourself. B. Get someone else to help you. C. Calmly explain the importance of the job and that once it is done a break can be taken. D. Take a break and then do the job. โ What is the characteristic of resistance in copper wire? Answer: It is inverse to its cross-sectional area.
โ What is the maximum time between taking a class in NFPA70E? Answer: 1 year โ OSHA or maybe it was some other agency???? Says the most common cause of electrical accidents among those that work with electricity is? Answer: A. ***Contact with overhead lines, misuse of electrical cords, not using equipment for intended purpose, not following manufactured guidelines. B. Not wearing appropriate PPE C. Misuse of large equipment, not setting up boundaries D. XXX โ You get called out to a lift station, the HMI screen is blank. What do you do? Answer: A. Call information systems or IT to fix. B. Turn it off/on *C. Notify operations to monitor the system while you troubleshoot and fix. D. XXX โ What appropriate steps to minimize affecting the process when tasked with fixing or replacing an Influent Pump? Think these steps out, what makes the most sense. What will not affect the process. What will reduce issues when doing the work. Answer: A. Trouble shoot, order material, perform work, create work order, notify operations. B. Notify ops, order material, perform work.
โ What is the first thing to do if someone is being shocked? Answer: Remove the person from the current โ VFD works by adjusting the? Answer: Frequency โ A soft starter works by? Answer: controlling the amount of voltage running through the motors circuits. It does this by limiting torque in the motor. This in turn allows the soft starter to reduce the voltage and allows it to gradually stop reducing the voltage to allow for a smooth progression of current. โ A commutator is found in what piece of equipment? Answer: DC motor โ The most important thing to do last when commissioning a new pump station is? Answer: A. Enter data, redline, update drawings, document changes. โ What type of test requires there to be a break in the circuit? Answer: A. Voltage *B. Amperage C. Megger D. Oscilloscope
โ What is single phasing? Answer: Single phasing is a condition that occurs when one of the three phases that is supplying voltage to a three- phase motor is lost. โ What is the most important reason to use a system like AMMS? Advance Maintenance Management Services Answer: To keep accurate up to date information โ While working at a pump station, a citizen asks you about what work you are doing, how do you respond? Answer: A. Tell them about what you are doing and how it relates to your system. B. Ignore them. C. Direct them to community outreach program. โ Rubber and leather gloves along with insulted tools is required while working above which voltage to ground? Answer: A. 250v B. 480v *C. 100v D. 600v โ Oxygen is safe or normal under what conditions? Answer: 19.5 to 23
โ A 3 phase motor with an FLA of 25 amps has these readings, A phase 26a, B phase 26.9a, C phase 27a. This motor is what? Answer: A. Overloaded B. Needs adjustment C. Fine D. Duty rated โ A flow meter that uses a small hole in a plate to measure flow is a what? Answer: A. Venturi B. Orifice C. Magnetic D. Rotometer โ A signal that goes from - to + is called a what? Answer: AC โ Whats the meaning of Hysteresis Answer: a lag between input and output in a system upon a change in direction. Hysteresis is something that happens with magnetic materials so that, if a varying magnetizing signal is applied, the resulting magnetism that is created follows the applied signal, but with a delay. โ ยท When finding volume, the tank maybe 30' high but only filled to 14' read the question and make sure you are performing the formula as it pertains to the question. Answer:?
โ The maximum safe current through a human body is between? Answer: 10ma and 20ma โ
