NETA III 2024 QUESTIONS WITH CORRECT SOLUTIONS

NETA III 2024 QUESTIONS WITH CORRECT SOLUTIONS 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 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 transformer 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 volt, 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 results 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 secondary 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