Official NETA Level 2 Exam Most Missed Questions, Spring 2000

[SecondGen]

Review the procedure for nulling the meter on a transformer turns ratio test set. 81% of technicians have missed this question.

Understand accuracy ratings for metering. Particularly, know how to calculate accuracy at points other than full scale. 74% of technicians do not understand these concepts.

Know the relative phase angle for a circuit having capacitive reactance and resistance. This question requires no calculation, just an understanding of the relative phase angles. 74% of technicians miss a question on this topic.

Study up on confined space. 67% of technicians do not know who keeps cancelled entry permits for a year.

Understand battery chargers and their role in a substation. In a correctly designed system, the charger must supply all load including indicating lamps and relay control power as well as maintain battery voltage. 63% of technicians believe that the charger provides current to maintain battery voltage and absolutely nothing else.

Research neutralization numbers for transformer oil acidity tests. 63% of technicians miss a question on this topic.


Note: 73 technicians took the NETA Level 2 exam in the spring of 2000. 29 passed.


Source: Official NETA internal memo from Rod Hageman, Technical Exam Chair to NETA Accredited Representatives dated July 21, 2000. Re: Spring 2000 Level II Certification Exam.

[Mjeelemco]

This is a good help! Thanks for all the help you give everyone on this site!

[cjones09]

Review the procedure for nulling the meter on a transformer turns ratio test set. 81% of technicians have missed this question.

Help with this, can someone explain the procedure? Is it still relevant 15 years later?

[prime_mover]

Help with this, can someone explain the procedure? Is it still relevant 15 years later?

Could you give some reference on this? Manufacturer maybe?

[SecondGen]

Help with this, can someone explain the procedure? Is it still relevant 15 years later?

Not sure if this question is still on the NETA exam or not, but it would definitley be a good thing to know to better understand the theory behind turns-ratio tests. All of the following comes from an old windup TTR instruction book from 1951!

79

Null Check: Adjust the dials to zero. Connect H1 clip to H2. Be sure X clamp screws do not touch anvils. Also see that the clamps to not touch each other.

Crank the generator so that the voltmeter, V reads 8 volts. Observe the detector, D. The pointer should rest exactly on the null mark at the center of the scale.

If necessary, adjust the meter to zero with a screwdriver while cranking at 8 volts. Stop cranking and again observe the detector. The pointer may rest slightly off zero. Should it be more than a sixteenth of an inch off, more troubleshooting is required.


Nothin' to it! However, there are two other self check tests you should know: Zero ratio check and Unity Ratio Check.

I found a PDF copy of the manual you can download here: http://exodus.poly.edu/~kurt/manuals/manuals/Other/BIDDLE_Model%203-TTR.pdf for anyone who wants to read up on it. You can find the troubleshooting procedures on page 55.

[dnigra]

Review the procedure for nulling the meter on a transformer turns ratio test set. 81% of technicians have missed this question.

Understand accuracy ratings for metering. Particularly, know how to calculate accuracy at points other than full scale. 74% of technicians do not understand these concepts.

Know the relative phase angle for a circuit having capacitive reactance and resistance. This question requires no calculation, just an understanding of the relative phase angles. 74% of technicians miss a question on this topic.

Study up on confined space. 67% of technicians do not know who keeps cancelled entry permits for a year.

Understand battery chargers and their role in a substation. In a correctly designed system, the charger must supply all load including indicating lamps and relay control power as well as maintain battery voltage. 63% of technicians believe that the charger provides current to maintain battery voltage and absolutely nothing else.

Research neutralization numbers for transformer oil acidity tests. 63% of technicians miss a question on this topic.


Note: 73 technicians took the NETA Level 2 exam in the spring of 2000. 29 passed.

good stuff. thanks

[MDTannen]

I've only ever used a wind up TTR. That's the one they make us new guys use! Great for learning the mechanical aspect.