NETA III Test Feb 2020

[mcamyott]

I would say about 25% of the questions on the exam were on this forum.

[Steviep]

I would say about 25% of the questions on the exam were on this forum.

I take mines on Thursday.. How did you do? Any tips on it?

[Steviep]

Just took my level 3 test today and did not pass with a 387. My test had a lot of commission questions and a lot of algebra. I wish the best to anyone else going to take it next testing period

[clipboardwarrior]

I took the test in this cycle. These are the questions I remember:

Where do you bond the neutral to ground in service switchgear: before or after the neutral disconnect link?

What would happen if you were to place the ground fault relay ahead of the N-G bond?

The resistance picture other folks have posted of the bus bars.

What power is dissipated across a particular inductor with a bunch in series and parallel.

You have a 0-2mA input and a 0-5V output. How do you make this work? 2.5k ohm resistor in series. in parallel. or a 5k ohm resistor in series. in parallel.

What would cause a low specific gravity in a battery?

An old motor has been replaced with a new, high efficiency motor. You are now getting trips at random times (can't remember if they were specific about only at start ups...i think they were...). What is the most likely cause?

You're troubleshooting in a building with a lot of high harmonic loads. They've been losing power. What is the most likely cause? (Sorry, I can't remember all of the symptoms.)

What are the three most common states for network protectors? open, closed, test. automatic, closed, open. etc etc

Voltage regulators have loads connected to what winding? shunt, series, can't remember the other options.

There were two or three questions on isolating a particular device in order to service it. What steps would you take to make it electrically safe to work on and in what order.

How often do you need to update your NFPA 70E lock out/tag out training?

What fuse config is most likely to be double barreled? Class R can't remember fuse size, 15kV 125E, 600V can't remember size fuse but I think it was current limiting, and 600V current limiting 4000A

I had a couple of commissioning questions just like StevieP: what information would you record when commissioning a UPS? What do you check for on a refurbished generator before start up?

What type of insulating oil is biodegradable? Askeral, FR3, Mineral oil, or Wexola

What is the benefit of a synchronous motor? One option was PF correction.

Testing frequency of gloves/blankets/sleeves?

You have fiber optic cable attached to the relay you are testing. What is most likely inscribed on the outer jacket? There were four options. They were all two numbers slashed: 9/100 for example. Just an example, I don't think it was one of the options.

Acceptable oxygen levels in confined space.

What ANSI device number is a phase sequence relay?

Convert 100kVARs to Farads given 4160V and 60Hz (must have given a PF as well but I can't remember what it was...).

What is the permissible difference in internal impedance of a battery from manufacturer specs?

Fire extinguisher classes. What is used for a fire in a 480V switchgear?

Reclosers have the same, more, or less interrupting capabilities as sectionalizers?

Given the image below, if you energize line "y," what will turn on?
431

Make the output in the image below true:
432

Apologies for my poor computer aided drawing skills. :rolleyes: I'll try to keep remembering.

Good luck to all taking it.

[clipboardwarrior]

Please ignore the attached thumbnail. I initially drew the picture incorrectly. Then realized my mistake and corrected it for the final post.

When terminating medium voltage cable, what do you do with the ground strap? One option was to run it back through the GF ct and attach to ground.

What must be provided in a confined space that is over 5' deep? A fixed ladder, continuous circulation of outside air, a mechanical means of retrieval, and I can't remember the fourth option.

An excellent app for practicing ladder logic in the exact ways they ask for it on the test is "Make It True." It provides nearly the same scenarios in an interactive way, and introduces the logic gates slowly so it's easier to remember and memorize.

[SecondGen]

Make the output in the image below true:
432


Circuit already appears to be true, is that a NAND gate at G and H? There are various points that can be energized and the state wouldn't change, do we know the options?

A-B OR is FALSE
C-D AND is FALSE
thus
AND 2 is FALSE

E-F OR is FALSE
G-H NAND is TRUE
thus
OR 2 is TRUE

AND 2 FALSE
OR 2 TRUE
thus
OR 3 (Output) is TRUE

Another great resource for learning these circuits is http://schematic.electronics-course.com/logic/ where you can build schematics and test them out for yourself. I recreated the one posted here, if I am reading the original correctly.

435

[SecondGen]

An old motor has been replaced with a new, high efficiency motor. You are now getting trips at random times (can't remember if they were specific about only at start ups...i think they were...). What is the most likely cause?

436

High transient currents during first few cycles? Would make sense if they reference startup...

https://www.motionindustries.com/motioncontent/knowledgehub/docs/stories/BALDOR%20-%20Manufacturing%20High%20Efficiency%20Motor%20Sta rting.pdf

[SecondGen]

What are the three most common states for network protectors? open, closed, test. automatic, closed, open. etc etc

Three most common states of NWP is Auto, Open, Closed

https://testguy.net/content/292-Network-Protector-Basics-Applications-Operation-and-Testing#nwp

[clipboardwarrior]

Three most common states of NWP is Auto, Open, Closed

https://testguy.net/content/292-Network-Protector-Basics-Applications-Operation-and-Testing#nwp

I must have guessed right! Network protectors weren't even on my studying radar...

As for the logic gate problem, they gave the choices in the following manner: (A or B) and (C and D) or (E or F) or not (G and H). Plus the wrong options. :) It was a bit of a chore to wade through, but the first one was right so I didn't have to go any further.

[SecondGen]

An old motor has been replaced with a new, high efficiency motor. You are now getting trips at random times (can't remember if they were specific about only at start ups...i think they were...). What is the most likely cause?

Do you remember if "high transient currents" was an option?

[clipboardwarrior]

Do you remember if "high transient currents" was an option?

I don't. I remembered as much as I could, but I was so stressed out. I'm surprised I remembered as much as I did.

[epenland]

What is the benefit of a synchronous motor?

[gchoquette]

Where do you bond the neutral to ground in service switchgear: before or after the neutral disconnect link?

What would happen if you were to place the ground fault relay ahead of the N-G bond?


According to Figure 1 and Figure 2 in the link below, the bond would be before the neutral disconnect.

The ground fault relay CT is also before the neutral disconnect (Figure 1), but a zero sequence CT (combining all phases) is placed after the neutral disconnect (Figure 2).

In response to the question, the N-G bond is solid and at the bottom of the service switchgear. It would be difficult to place the relay CT before (from ground as the reference), the CT is normally after (unless you are using a different frame of reference).

https://electrical-engineering-portal.com/scheme-sensing-ground-faults

[Warrengarber]

One of the other members posted some questions that he remembered from his exam. One of the questions was
"You're troubleshooting in a building with a lot of high harmonic loads. They've been losing power. What is the most likely cause? (Sorry, I can't remember all of the symptoms.)"

I know that high harmonics are seen on the Neutral so would that be an answer? Could cause problems with neutral sensors or ground fault tripping. Any thoughts. My exam is at the end of next month so I am getting ready again.