NETA III Exam Questions with Correct Answers
The alternate source for emergency systems are required to be equipped with ground-fault protection of equipment. - ANSWER False
Which ANSI/IEEE standard covers SF6 circuit breakers? - ANSWER C37.04
You measure the winding resistance ...
NETA III 2023 -2024 Exam Questions with Correct Answer s The alternate source for emergency systems are required to be equipped with ground -
fault protection of equipment. - ANSWER False Which ANSI/IEEE standard covers SF6 circuit breakers? - ANSWER C37.04 You measure the winding re sistance of a 12.4kV, 1000kVA, Delta -Delta connected transformer with a 100A test set. H1 -H2 measures 42.0 microhms, H2 -H3 measures 41.9 microhms, and H3 -H1 measures 84.0 microhms. What can you conclude from these readings? - ANSWER One phase of the transformer is open. When monitoring for entries involving a decent into atmospheres that may be stratisfied, the envelope should be tested at a distance of approximately _____ feet in the direction of travel and to each side. - ANSWER 4 The transf ormer manufacturer should be consulted if winding -resistance test values vary by more than _____ percent from factory test values or between adjacent phases according to NETA acceptance testing standards. - ANSWER 2 A DC shunt motor should never be operated: - ANSWER with the field circuit open What is the expected torque (pound -feet) value of a 3/8" Grade 5 bolt? - ANSWER 20 The generally accepted limits of deviation from the nominal 60Hz utility power frequency is: - ANSWER . 50Hz Power Factor testing is least effective on which of the following? - ANSWER MV Cable Which of the following insulating liquid tests is optional when maintenance testing a 13.2kV -4.16kV 1500kVA transformer with silicone fluid per NETA standards? - ANSWER ASTM D1298 Panelboards equipped with snap switches of rating 30 amps or less shall be provided with over -current protection of not more than _____ . - ANSWER 200 amps Underground service conductors between the terminals of service equipment and service lateral or underground service conductors are termed as _____ . - ANSWER Service Entrance Conductors What is a dual element fuse used for? - ANSWER Operate with a temporary overload The full -load current for a single -phase alternating current 115 vo lt, 1 horsepower motor is which of the following: - ANSWER 16 A Infrared surveys should be performed during periods of maximum possible loading but not less than _____ % of rated load of the electrical equipment being inspected. - ANSWER 40 Decreasing the opening time of the overcurrent protective device will decrease Arc -
Flash hazards. - ANSWER true In a wye connected system, without neutral grounding, zero sequence currents are: - ANSWER zero When evaluating insulation test res ults on a medium -voltage, air -magnetic circuit breaker, what quantity is evaluated? - ANSWER watts -loss In accordance with NETA and IEEE standards, the correct acceptance test voltage (dc) for 35KV rated EPR 133% insulation level cable is? - ANSWER 124kV Calculate the circuit time constant of an inductor having resistance value of 100 ohms and an inductance value of 4 Henry: - ANSWER 0.04 sec T=L/R Transformer polarity: - ANSWER Is of concern when multiple sets of primary and seco ndary windings are interconnected Identify the least reliable power system arrangement: - ANSWER Radial w/ Primary Selectivity The hot collar bushing test should be performed using which of the following test modes? - ANSWER UST GST GST-g R rated fuses are used for: - ANSWER Protection for motors R-rated fuses provide required short -circuit protection for medium voltage motors, motor controllers and associated circuitry. Relays provide both overload protection and locked rotor protect ion to the motor. Which of the following would be a factor in choosing between 100%, 133%, and 173% Medium voltage cable for a power system? - ANSWER Ground Fault protection During the performance of a thermographic scan of similar components withi n the switchboard that are under similar load, at what temperature difference does NETA recommend investigation? - ANSWER 1-3 deg C In calculating the thickness of insulators for high -voltage AC power lines, which type of measurement is the best to use for voltage? - ANSWER Peak What type of sensing element can measure a transformer's hottest -spot (winding) temperature directly? - ANSWER Fiber optic cable Before acceptance testing begins, what steps should be taken as part of the commis sioning process? - ANSWER Inspect devices for variations from design specifications Which of the following would not significantly reduce ground resistance? - ANSWER Increased ground rod diameter In a typical stepped distance protection schem e, Zone 4 is used as a backup for an adjacent transmission line in the reverse direction in case the protection in that line fails. This zone is usually set to _____ of the adjacent line. - ANSWER 20-50% The power factor of SF6 circuit breaker bushi ngs is to be within _____ percent of nameplate per NETA -ATS. - ANSWER 10% Two 5H inductors connected in series are subjected to an electric current that changes at a rate of 4.5 amps per second. How much voltage will be dropped across the series combination? - ANSWER 45.00 V = L(di/dt) Be aware of "Two 5H inductors" - Inductors Add Hard hats suitable for the performance of low voltage electrical work, but NOT for higher voltage electrical work, are identified as being: - ANSWER Class G Which of the following would NOT be part of the test plan for a 21 device? - ANSWER Determine pickup frequency Confined space attendants may be assigned to monitor more than one permit space. - ANSWER True
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Scholarsstudyguide. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £11.96. You're not tied to anything after your purchase.
