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CWEA E1 Study Set| 137 Questions & 100% Correct Answers
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CWEA E1 Study Set| 137 Questions &100% Correct Answers
What happens when a motor loses one phase out of 3? - ✔✔Single phasing will cause the motor
to trip the overload heaters.
What does a Pitot tube do? - ✔✔Measures velocity of low to medium gas flow applications.
PH range? - ✔✔0-14
7 is neutral.
Less than 7 is acidic.
More than 7 is base (alkaline)
How long is a confined space permit valid for according to OSHA? - ✔✔No longer than it takes to
get the work done.
Entry permits are valid for more than one shift if permit info contains provisions covering shifts.
The voltage from phase to ground in a 480v transformer is? - ✔✔277 volts.
Signal range for pneumatics? - ✔✔3-15psi. 3-6-9-12-15
Intrinsic safety is? - ✔✔Barrier preventing excess voltage or current from reaching in hazardous area.
, How do you add capacitors in series? - ✔✔Same as resistors.
How many paths in a parallel circuit? - ✔✔More than 1.
Determined "Power Factor" formula. - ✔✔PF=kw/kva
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
How long before digging do you notify "dig alert"? - ✔✔2 days.
Dig Alert number? - ✔✔811
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.
An electronic tachometer works by? - ✔✔Receiving voltage pulses from and ignition signal.
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