CWEA Electrical and Instrument Grade
2 Study Guide
What is PPE Category 1? - ANS-Arc-Rated clothing, Minimum Arc Rating of Arc 4
cal/cm2
arc-rated long sleeve shirt and pants or overall
Parshall Flume Measurement point? 1.2 FT Water Height 20.8xH at measurement point
- ANS-Possible answer:72,607 MGD
Absoulte Pressure Gauge? What is True? - ANS-Possible answer: Read more accurate
or 14.7 PSI higher
Flow meter that uses electrodes is? - ANS-Magnetic Flow Meters
What is the resister color code : Orange, White,Silver,Gold Band - ANS-.39 Ohms
Pitot tube measures? - ANS-Measures Fluid or Gas Velocity
Chlorine Analyzer reads lower ever time but grab sample shows level are good. What
do troubleshoot first? - ANS-Buffer
How to complete a work order when asked to maintain a pump? - ANS-Notify
Operation, purchase parts, maintain, test, notify complete
What shunt resister rating to make 1-5V change on 4-20ma signal? - ANS-250 ohms
HMI Screen down at the pump station, what to do? - ANS-Ask operator to monitor while
you troubleshoot and try to fix
Where does the fluid enter in a Rotameter? - ANS-Bottom
RPM on 4 pole 60 Hz motor - ANS-1800 RPM
If 17.32v are applied across a resistance of 50 ohms, how much power is expended in
the resistor? - ANS-6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
Signal range for pneumatics? - ANS-3-15psi. 3-6-9-12-15
, If transformer primary=120v and secondary 12v=20 amps, what are the amps on the
primary? - ANS-2 amps.
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
What happens when a motor loses one phase out of 3? - ANS-Single phasing will cause
the motor to trip the overload heaters
What instrument do you use to measure 4-20 mA? - ANS-DC clamp meter
How do you connect an ammeter to check an electrical circuit? - ANS-In series with the
load.
If you are angry or impatient with one worker you should? - ANS-Avoid transferring that
feeling to others.
First step in troubleshooting a programmable logic controller(PLC) system is? - ANS-
Know the process
Which of the following actions should be taken before working on controls that may
disrupt plant operations? - ANS-Have an operator present.
Which of the following best describes the efficiency of preventive maintenance for plant
equipment? - ANS-Periodic inspection of facilities to discover developing defects that
could lead to equipment failure.
In a 240v-120v Delta system, the high leg is? - ANS-208v
What class and division above water on a primary clarifier? - ANS-Class 1 Division 2
AC reads out how? - ANS-Peak to peak.
What do you use to clean Electrical instruments? - ANS-For Electro-pnuematic
Positioners you use solvent.
Where are the overloads installed on a wire diagram? - ANS-Before circuit protection, in
series with the line leads.
2 Study Guide
What is PPE Category 1? - ANS-Arc-Rated clothing, Minimum Arc Rating of Arc 4
cal/cm2
arc-rated long sleeve shirt and pants or overall
Parshall Flume Measurement point? 1.2 FT Water Height 20.8xH at measurement point
- ANS-Possible answer:72,607 MGD
Absoulte Pressure Gauge? What is True? - ANS-Possible answer: Read more accurate
or 14.7 PSI higher
Flow meter that uses electrodes is? - ANS-Magnetic Flow Meters
What is the resister color code : Orange, White,Silver,Gold Band - ANS-.39 Ohms
Pitot tube measures? - ANS-Measures Fluid or Gas Velocity
Chlorine Analyzer reads lower ever time but grab sample shows level are good. What
do troubleshoot first? - ANS-Buffer
How to complete a work order when asked to maintain a pump? - ANS-Notify
Operation, purchase parts, maintain, test, notify complete
What shunt resister rating to make 1-5V change on 4-20ma signal? - ANS-250 ohms
HMI Screen down at the pump station, what to do? - ANS-Ask operator to monitor while
you troubleshoot and try to fix
Where does the fluid enter in a Rotameter? - ANS-Bottom
RPM on 4 pole 60 Hz motor - ANS-1800 RPM
If 17.32v are applied across a resistance of 50 ohms, how much power is expended in
the resistor? - ANS-6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
Signal range for pneumatics? - ANS-3-15psi. 3-6-9-12-15
, If transformer primary=120v and secondary 12v=20 amps, what are the amps on the
primary? - ANS-2 amps.
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
What happens when a motor loses one phase out of 3? - ANS-Single phasing will cause
the motor to trip the overload heaters
What instrument do you use to measure 4-20 mA? - ANS-DC clamp meter
How do you connect an ammeter to check an electrical circuit? - ANS-In series with the
load.
If you are angry or impatient with one worker you should? - ANS-Avoid transferring that
feeling to others.
First step in troubleshooting a programmable logic controller(PLC) system is? - ANS-
Know the process
Which of the following actions should be taken before working on controls that may
disrupt plant operations? - ANS-Have an operator present.
Which of the following best describes the efficiency of preventive maintenance for plant
equipment? - ANS-Periodic inspection of facilities to discover developing defects that
could lead to equipment failure.
In a 240v-120v Delta system, the high leg is? - ANS-208v
What class and division above water on a primary clarifier? - ANS-Class 1 Division 2
AC reads out how? - ANS-Peak to peak.
What do you use to clean Electrical instruments? - ANS-For Electro-pnuematic
Positioners you use solvent.
Where are the overloads installed on a wire diagram? - ANS-Before circuit protection, in
series with the line leads.
