CWEA ELECTRICAL AND INSTRUMENTATION
GRADE 2 UPDATED QUESTIONS AND ANSWERS
RATED A+
✔✔Molde Case Breakers are used for? - ✔✔Short circuit or Overload
✔✔Nema Enclosure differences? - ✔✔
✔✔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
✔✔On a a circuit motor starter there are two start switches. Where does the second
starter switch wired ? - ✔✔Parallel with coil
✔✔Commonly used instead of fuses in industrial
power distribution systems are: - ✔✔Circuit Breakers
✔✔What is NEC Article for Solar Panel photovoltaic - ✔✔ARTICLE 690
✔✔On 3 phase power what is the minimum numbers of wire you can use? - ✔✔4 wires
✔✔If Level is 5.75 ft and wetwell is 20 feet what is the milliamp? - ✔✔8.6 ma
✔✔What is Reluctance? - ✔✔magnetic materials ability to oppose the magnetic flux
✔✔What is the property of a coil of wire that opposes any change in the current in the
coil? - ✔✔Inductance
✔✔What is PPE Category 1? - ✔✔single layer of arc-rated PPE, Long Sleeve Shirt (or
Jacket) and Pants or Coverall with minimum arc rating of 4 cal/cm.
, ✔✔Is the Oxygen Safe Zone at 22% Safe? - ✔✔Yes, the safe zone is between 19.5%
to 23.5%
✔✔L.O.T.O. - ✔✔Lock out tag out
✔✔In a 480 transformer, the voltage from one phase to ground is? - ✔✔277 volts.
✔✔What is the main electrical danger when using corded power tools? - ✔✔A short
circuit
✔✔Shielding protects an analog meter from? - ✔✔Stray magnetic fields.
✔✔The frame, core, winding and end plates are all parts of? - ✔✔A stator.
✔✔If 17.32v are applied across a resistance of 50 ohms, how much power is expended
in the resistor? - ✔✔6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
✔✔Signal range for pneumatics? - ✔✔3-15psi. 3-6-9-12-15
✔✔If transformer primary=120v and secondary 12v=20 amps, what are the amps on the
primary? - ✔✔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? - ✔✔Single phasing will
cause the motor to trip the overloads
✔✔What instrument do you use to measure 4-20 mA? - ✔✔DC clamp meter
✔✔How do you connect an ammeter to check an electrical circuit? - ✔✔In series with
the load.
✔✔If you are angry or impatient with one worker you should? - ✔✔Avoid transferring
that feeling to others.
GRADE 2 UPDATED QUESTIONS AND ANSWERS
RATED A+
✔✔Molde Case Breakers are used for? - ✔✔Short circuit or Overload
✔✔Nema Enclosure differences? - ✔✔
✔✔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
✔✔On a a circuit motor starter there are two start switches. Where does the second
starter switch wired ? - ✔✔Parallel with coil
✔✔Commonly used instead of fuses in industrial
power distribution systems are: - ✔✔Circuit Breakers
✔✔What is NEC Article for Solar Panel photovoltaic - ✔✔ARTICLE 690
✔✔On 3 phase power what is the minimum numbers of wire you can use? - ✔✔4 wires
✔✔If Level is 5.75 ft and wetwell is 20 feet what is the milliamp? - ✔✔8.6 ma
✔✔What is Reluctance? - ✔✔magnetic materials ability to oppose the magnetic flux
✔✔What is the property of a coil of wire that opposes any change in the current in the
coil? - ✔✔Inductance
✔✔What is PPE Category 1? - ✔✔single layer of arc-rated PPE, Long Sleeve Shirt (or
Jacket) and Pants or Coverall with minimum arc rating of 4 cal/cm.
, ✔✔Is the Oxygen Safe Zone at 22% Safe? - ✔✔Yes, the safe zone is between 19.5%
to 23.5%
✔✔L.O.T.O. - ✔✔Lock out tag out
✔✔In a 480 transformer, the voltage from one phase to ground is? - ✔✔277 volts.
✔✔What is the main electrical danger when using corded power tools? - ✔✔A short
circuit
✔✔Shielding protects an analog meter from? - ✔✔Stray magnetic fields.
✔✔The frame, core, winding and end plates are all parts of? - ✔✔A stator.
✔✔If 17.32v are applied across a resistance of 50 ohms, how much power is expended
in the resistor? - ✔✔6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
✔✔Signal range for pneumatics? - ✔✔3-15psi. 3-6-9-12-15
✔✔If transformer primary=120v and secondary 12v=20 amps, what are the amps on the
primary? - ✔✔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? - ✔✔Single phasing will
cause the motor to trip the overloads
✔✔What instrument do you use to measure 4-20 mA? - ✔✔DC clamp meter
✔✔How do you connect an ammeter to check an electrical circuit? - ✔✔In series with
the load.
✔✔If you are angry or impatient with one worker you should? - ✔✔Avoid transferring
that feeling to others.
