×
Follow Us
Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 32

NETA 4 Exam Questions 1/2017

 Jump to latest post
Page 2 of 4 FirstFirst 1234 LastLast
    #11
  1. Join Date
    Jun 2017
    Posts
    4
    Reputation

    Thanks

    Just wanted to thank everyone for the input in this thread. Has for sure helped in my studying, me and the PE of the company are taking the test tomorrow, and two of our other guys have taken it this month. I was told to look out for lots of questions on fiber optics, especially optical time domain reflectometry, good amount on batteries and calculating transformer load, and a random question on knowing when Bellville washer is bad, which I haven't found too much info on. Here's a good article for transformer through fault testing I found helpful, and about FR3

    http://blog.fauske.com/blog/primary-...r-transformers

    https://static1.squarespace.com/stat...3-insulect.pdf

  2. #12
  3. Join Date
    Dec 2014
    Location
    Houston, TX
    Posts
    11
    Reputation
    Quote Originally Posted by slts1991 View Post
    Thanks for the input. Here are some answers

    Please correct me if I'm wrong:

    1.A (Optic time domain reflectometry)

    5.C

    7. You did not specify the xfmr connection but assuming it is Delta/Wye my calculation is 3007.12 A primary

    8. 5th Harmonic

    10. Methane (Duval's Triangle)

    11. 0.41 miliohms

    12. 60A / sqrt(3) = 34.64A
    On a Wye connection your phase current is equal to your line current but in a delta it is divided by 1.732


    13. 1825.8 @ 0.91 PF

    14. Requires no connection to ground (earth)

    15.B (not required, NEC 700.6(D))

    16.C (most likely since CAT6 length limit is 100 m)

    17.B

    18.A

    19.C

    20. Dielectric withstand @ 75% of Factory acceptance testing value (IEEE C37.20.6)

    22.D (C200 since i came up with a burden of aprox 1.25 ohms which exceed the error limit of a C100)

    24.B (0.89 vs 0.92)

    25 The line reactor compensates for line capacitance, mitigates voltage transients and limits the fault currents. I don't know what the answers were there.

    26. They are used in PLC (Power Line Carrier) to trap the high frequency communication signals typical of 400 Hz

    29.D maybe? (Lead-acid is 5 years and VRLA 12-18 months so we need more info here)

    31. 2.3 micro-farad

  4. #13
  5. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    508
    Reputation
    Quote Originally Posted by ddd675 View Post
    5. On a main incoming of a 480V switchgear, what class powermeter should be installed?
    a. II
    b. III
    c. IV
    d. V
    Click image for larger version. 

Name:	multimeter-overvoltage-installation-categories.png 
Views:	87 
Size:	82.4 KB 
ID:	207

    Cat IV is is for 3 phase at utility connection.

  6. #14
  7. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    508
    Reputation

    IEC61850-8-1 Object Name

    Quote Originally Posted by ddd675 View Post
    23. What is the IEC 61850 naming structure?
    Relay1/XCBR1$ST$Loc$stVal

    Relay1 = Logical Device
    XCBR1 = Logical Node
    ST = Functional Constraint
    Loc = Data
    stVal = Attribute

    http://www.ucaiug.org/Meetings/Austi...0-Tutorial.pdf

    Click image for larger version. 

Name:	IEC61850-naming-1.png 
Views:	738 
Size:	9.2 KB 
ID:	210

    Click image for larger version. 

Name:	IEC61850-naming-2.png 
Views:	737 
Size:	10.1 KB 
ID:	211

    Click image for larger version. 

Name:	IEC61850-naming-3.png 
Views:	741 
Size:	13.9 KB 
ID:	212

    Click image for larger version. 

Name:	IEC61850-naming-4.png 
Views:	720 
Size:	6.5 KB 
ID:	213

  8. #15
  9. ElectricalTestTech's Avatar
    ElectricalTestTech is offline NETA Level IV
    Affiliate Member
    Pro Subscriber
    Join Date
    Sep 2017
    Location
    Washington, DC
    Posts
    69
    Reputation
    Just keep in mind, the new structure of the test recognizes which questions continuously get correct answers. The new structure throws out those questions and inputs different ones so the test can continuously change. While it is good to know the questions put up on this forum, do not expect them to be on your test.

  10. #16
  11. testguy's Avatar
    testguy is offline Administrator Administrator
    Join Date
    Apr 2010
    Location
    United States
    Posts
    558
    Reputation
    Quote Originally Posted by ElectricalTestTech View Post
    Just keep in mind, the new structure of the test recognizes which questions continuously get correct answers. The new structure throws out those questions and inputs different ones so the test can continuously change. While it is good to know the questions put up on this forum, do not expect them to be on your test.
    This is an excellent point. It cant be emphasized enough that when taking the practice exam its important to focus on the subject matter rather than the actual question and answer. We are looking into implementing a similar feature that stops showing you questions after answering them correctly a certain number of times. This way users who frequently take exams will continue to see fresh questions in subsequent exams.

  12. #17
  13. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    508
    Reputation
    Quote Originally Posted by ddd675 View Post
    16. Which SCADA communication is only appropriate for short distances?
    a. RS232
    b. RS485
    c. CAT6
    d. Fibre

    Here are the max distances for each:

    RS232 (50 feet)
    RS485 (1220 meters)
    CAT6 (100 meters)
    Fiber (2000 meters)

  14. #18
  15. MartyCoyne is offline Junior Member Pro Subscriber
    Join Date
    May 2018
    Posts
    15
    Reputation

    Wattmeter question

    Three coils with a resistance of 4 ohms and impedance of 13 ohms each are connected in wye to a 120/208 Volt panel. What will each wattmeter indicate if three single-phase wattmeters are used to measure the power?

    Help: What will each wattmeter indicate?

  16. #19
  17. Join Date
    Jan 2019
    Posts
    19
    Reputation
    Quote Originally Posted by ddd675 View Post
    31. While testing a 100KVAR 480V 3 phase wye connected capacitor. What would the expected uF be across A-B terminals.

    Using E^2/R = P, you can manipulate to get Xc = E^2/Q (or P).

    Plug that in to C=1/(2*pi*f*Xc) gives C = Q/(2*pi*f*E^2) to get phase capacitance of 1151uF. If you used 1/3 of bank KVAR (33.3kVar) and phase voltage (277), you would get a similar result. Both of these will give you a per phase uF.

    To me, the straight forward solution is to look at the WYE and solve E^2/R = P. and plug R into Xc formula to get 1152uF.

    Caps in series act like resistors in parallel, so take half of that to get the capacitance measure between A-B = 576

    I also found this reference which helped me decided which method I will use on the test.

    https://www.se.com/us/en/faqs/FA323640/
    Last edited by young_dad; November 26, 2019 at 08:37 AM.

  18. #20
  19. Join Date
    Jan 2019
    Posts
    19
    Reputation
    Quote Originally Posted by ddd675 View Post
    12. There is 60 amps measured on the line of a delta transformer secondary. How many amps are in the delta?
    IL = 1.732IP in a delta, so solving for IP (in the delta) I get 34.6A.

Page 2 of 4 FirstFirst 1234 LastLast
Subscribe

Share this thread

Related Topics

  1. NETA 4 exam questions I am unsure about
    By mmacdonell in forum NETA Level 4 Exam
    Replies: 2
    Last Post: August 6, 2021, 07:15 AM
  2. Why so few questions for NETA 4 exam?
    By mmacdonell in forum NETA Level 4 Exam
    Replies: 3
    Last Post: February 10, 2020, 12:14 PM
  3. Questions and Topics I Remember From The NETA 2 Exam
    By rofo42 in forum NETA Level 2 Exam
    Replies: 8
    Last Post: November 22, 2019, 10:40 AM
  4. Questions from recent Level 2 exam (10/2017)
    By Tech1120 in forum NETA Level 2 Exam
    Replies: 10
    Last Post: July 5, 2018, 08:46 PM
  5. Neta 3 Exam pointers and questions
    By Zepold72 in forum NETA Level 3 Exam
    Replies: 13
    Last Post: April 29, 2016, 05:25 PM

Tags for this Thread

Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support




You are viewing the archives. Enjoy new features and join the conversation at wiki.testguy.net