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CWEA Electrical and Instrument Grade 2 Study Guide
1. What is PPE Category 1?: Arc-Rated clothing, Minimum Arc Rating of Arc 4
cal/cm arc-rated long sleeve shirt and pants or overall
2.Parshall Flume Measurement point? 1.2 FT Water Height 20.8xH at measure- ment
point: Possible answer:72,607 MGD
3. Absoulte Pressure Gauge? What is True?: Possible answer: Read more accu- rate
or 14.7 PSI higher
4.Flow meter that uses electrodes is?: Magnetic Flow Meters
5.What is the resister color code : Orange, White,Silver,Gold Band: .39 Ohms
6.Pitot tube measures?: Measures Fluid or Gas Velocity
7. Chlorine Analyzer reads lower ever time but grab sample shows level are good.
What do troubleshoot first?: Buffer
8. How to complete a work order when asked to maintain a pump?: Notify
Operation, purchase parts, maintain, test, notify complete
9. What shunt resister rating to make 1-5V change on 4-20ma signal?: 250 ohms
10.HMI Screen down at the pump station, what to do?: Ask operator to monitor while
you troubleshoot and try to fix
11.Where does the fluid enter in a Rotameter?: Bottom
12.RPM on 4 pole 60 Hz motor: 1800 RPM
13.For every 10 Celsius change in operating temp. What happen to motor wire
insulation?: Degrades 50%
14.What is it called when teaching someone Electrical Task Training?: Safety Task
Training
15.Personnel injured when working around machines/equipment depending what
they do. Based on this: What two classification?: Authorized-Affected
16.Resistors wired in parallel on battery 5 ohms, 10 ohms, and 20 ohms. what
must be the voltage to force 2.4 amp ?: 6.84 V
17.Best way to test someone after training them?: Have them teach others or have
them perform the task under supervision
18.What is amperage 1000 Watts pulled through 12.5 ohms?: 8.9 amps
19.What is one way to prolong life of vertical shaft well motor?: make sure plenty
of grease, lube bearings, make sure fail seal hooked up
20.Grounding analog signal both end of wire or one end only?: Ground only one
end analog of wire
21. .15KvA transformer 480-120. How much amps can you pull on 120 side?: -
1.25 amps 150/120=1.25 amp
22.What are transformer measured in?: KVA
23.What should flow meter read in this open-channel thing? 36" wide 30" water
depth flow is 2 feet per second: 9.69 MGD
24.If equipment failure is the condition in which a piece of equipment does not
operate as intended: Failure Report
25.What is the highest Category?: Category 4
26.Molder Case Breaker?: Short circuit or Overload
27.Nema Enclosure differences?: Weather proof
28.How do you make a conveyor belt go faster and a VFD slower?: Increase pulley
on the conveyor side and decrease pulley on VFD side
29.On a a circuit motor starter there are two start switches. Where does the second
starter switch wired ?: Parallel with coil
30.Commonly used instead of fuses in industrial
power distribution systems are:: Circuit Breakers
Formula: I =Amps/Volume of current E = Volts/Force moving the current P = Watts, Electrical power produced I x E=P 12 x 20=240watts In a transformer watts stay the same so now: P/E=I 240/120v=2 amps
46.What happens when a motor loses one phase out of 3?: Single phasing will cause
the motor to trip the overload heaters
47.What instrument do you use to measure 4-20 mA?: DC clamp meter
48.How do you connect an ammeter to check an electrical circuit?: In series with
the load.
49.If you are angry or impatient with one worker you should?: Avoid transferring that
feeling to others.
50.First step in troubleshooting a programmable logic controller(PLC) system is?:
Know the process
51.Which of the following actions should be taken before working on controls that
may disrupt plant operations?: Have an operator present.
52.Which of the following best describes the efficiency of preventive mainte- nance for
plant equipment?: Periodic inspection of facilities to discover developing defects that could lead to equipment failure.
53.In a 240v-120v Delta system, the high leg is?: 208v
54.What class and division above water on a primary clarifier?: Class 1 Division 2
55.AC reads out how?: Peak to peak.
56.What do you use to clean Electrical instruments?: For Electro-pnuematic
Positioners you use solvent.
57.Where are the overloads installed on a wire diagram?: Before circuit protec- tion,
in series with the line leads.
58.Arc-rated clothing is rated?: Cal/Cm
59.Whats the maximum ampacity on #12 rated wires THWN?(Thermoplastic Heat and
Water-resistant Nylon-coated): 20 amps.
60.On a 480v 3 phase wye, the nuetral and line phase are?: he same times the
square root of 3 (1.73)=480. (Comes to 277v)
61.What happens to the speed of a 3 phase motor with an "unbalanced load"?:
It's called single phasing and will burn/heat up the motor quickly.
62. In excess of what voltage shall insulated tools and gloves be worn for?: -
120v
63.A 3 phase motor shows 15 FLA.(Full Load Amperes) You have readings of 15.6, 16.
and 15.9, what is the condition of the motor?: The motor is overloaded.
64.4-20 mA output for a device with a range of 0-63,535. Read is 6 mA. What is the
measurement reading?: 6mA/20mA= 0.3, 0.3 x 63,535= 19,060.
65.Ladder Diagram: Ladder diagrams are specialized schematics commonly used
to document industrial control logic systems(PLCs). They are called "ladder" diagrams because they resemble a ladder, with two vertical rails (supply power) and as many "rungs" (horizontal lines) as there are control circuits to represent.
66.How to measure 4-20ma with a digital multi meter.(DMM): Disconnect one wire of
the loop and connect the DMM in series.
67.How far from the disconnect should a pump be located?: located within sight from
and not at a distance greater than 15 m (50 ft) from the motor and equipment.
What is the PSI?: Do Calculation
78.A pipe has a 10" opening , and produces 2500 GPM. How many cubic
feet/sec?: Do Calculations
79.How is true power expressed? I am not sure if these were the exact possible
answers, but they are close: KW
80.You took apart a 3 phase motor, meggered a motor lead to the housing, and read
5000 ohms. What does this mean?: B. Motor is fine
81. A 500hp, 3 phase, 460v, 8-pole, 900 rpm motor is connected to a 5:1 gear box.
What is the rpm of the output shaft? Forget about all the needless information. The question gives the rpm of the motor that's all you need.: Do Calculations
82.What drawing does a PLC use?: Ladder
83.What does NFPA820 cover?: Wastewater and Collections
84.When should you megger a motor for its lowest insulation readings?: Im-
mediately after shutting down equipment.
85.In a start stop control circuit, an additional two stop buttons are to be added.
These stop buttons should be installed in which way?: In series with the existing stop
86.Redline drawings are best described as?: A way for contractors to show
additional work and changes to the system.
87.Redlines should be used to?: Check the engineer
88.Best way to check a 4-20ma signal?: Place DMM selector to mA and put leads in
series with the circuit.
89.What is the most important step when performing a megger test?: Put the leads
together and verify a direct short
90. A diaphragm type gauge protector is used in which type of environment?-
: Corrosive
91.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?: 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.
92.What is the characteristic of resistance in copper wire?: It is inverse to its cross-
sectional area.
93.What is the maximum time between taking a class in NFPA70E?: 1 year
94.OSHA or maybe it was some other agency???? Says the most common cause of
electrical accidents among those that work with electricity is?: 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
95.You get called out to a lift station, the HMI screen is blank. What do you do?: 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
96.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.: A. Trouble shoot, order material, perform work, create work order, notify operations.
106. The most important thing to do last when commissioning a new pump
station is?: A. Enter data, redline, update drawings, document changes.
107. What type of test requires there to be a break in the circuit?: A. Voltage
*B. Amperage C. Megger D. Oscilloscope
108. What is single phasing?: Single phasing is a condition that occurs when
one of the three phases that is supplying voltage to a three-phase motor is lost.
109. What is the most important reason to use a system like AMMS? Advance
Maintenance Management Services: To keep accurate up to date information
110. While working at a pump station, a citizen asks you about what work you are
doing, how do you respond?: 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.
111. Rubber and leather gloves along with insulted tools is required while
working above which voltage to ground?: A. 250v B. 480v *C. 100v D. 600v
112. Oxygen is safe or normal under what conditions?: 19.5 to 23
113. You are in a confined space and you meter goes off at LEL 10 percent, the
gas is ....... I forgot. What should this level be if it were safe????? Know your hazardous gas level tolerances.:?
114. Most dangerous part of working with batteries, solar panels, UPS is?: A. Arc
flash when managing cables.
115. Most common communicator?: HART
116. A resistor with the colors orange, orange/white, XXX, XXX, what is its
value? Know your resistor color values.: 33 G ohms
117. Testing a DC ..... I forgot you should.: A. Pull each xxx individually
B. ***Disconnect A1, A
C. Disconnect A1, T
D.Disconnect T1, T
118. A molded case breaker is designed to protect against what?: A. Overcur-
rent B. Overcurrent and short circuits C. Short circuits
119. 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?: A. Overloaded
B. Needs adjustment
C. Fine
D.Duty rated
120. A flow meter that uses a small hole in a plate to measure flow is a what?: A.
Venturi
B. Orifice
C. Magnetic
D.Rotometer
121. A signal that goes from - to + is called a what?: AC
122. Whats the meaning of Hysteresis: 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.
123. · 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.:
