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
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