NETA 2 Top Exam Questions and answers, rated A+

NETA 2 Top Exam Questions and answers, rated A+ Under what considerations can tag out without lock out be permitted? - -***&If an energy isolating device is not capable of being locked For PV systems, a(n) _____ is a device that changes direct-current input to an alternating-current output. - -Inverter Identify the contact pictured above. (NC and NO separated by a node) - -Form C When applying personal protective grounds, which end is attached first? - -***&The equipment end An induction motor has 40kVA input power, a power factor of 82 percent, and an efficiency of 92 percent. What is the horsepower? - -***&30.2 HP How many connection points would you expect to find on a kelvin bridge? - -4 You arrive at a job to perform acceptance testing on a new-indoor 15KV switch lineup. While the equipment has been installed multiple covers are off there are power conductors hanging with taped ends. What should you do? - -***&Visually confirm that the source of power have already been de-energized and lock out What is the turns ratio of a 3-phase 500kVA, 13,200-480 volt rated delta-delta transformer that is 80% loaded? - -***&22.000 ***27.500 ASTM D 924 is a required acceptance test for liquid-filled transformers with natural ester insulating fluid per NETA standards. - -***&True NETA-ATS requires test decals be affixed on the exterior of equipment or equipment enclosure of protective devices after performing electrical tests. Which color test decal would you affix to a piece of equipment with a minor deficiency that does not affect its fault detection or operation? - -Yellow What is meant by a "dead tank breaker?" - -The external tank is grounded. If you have your ground conductor running through your zero-sequence CT with your current carrying conductors, what will happen? - -Ground fault protection won't function Which of the following would best describe a 52 device: - -AC circuit breaker A series circuit has two resistors. The resistors dissipate 10 W and 15 W. What is the total power dissipation of the circuit? - -25 W Which of the following would be the best choice for use in both the conductive and mechanical areas of circuit breakers and switches? - -Mobil 28 What is the power factor temperature correction value for new mineral oil? - -***&20C/40C OSHA requires the testing of a volt meter after a voltage test on voltage above ______. - -600V A tagout device must be strong enough to remain attached under a minimum of ____ lbs of force. - -50 A piece of wire that is 0.001 inches in diameter and 12 inches long is one mil-foot. - -True At least 2 entrances of sufficient area must be provided giving access to the electrical equipment working space. - -***&True What is the Restricted Approach Boundary for a 69kV system? - -***&3 ft 10 in. Which portion of the transmission system experiences faults occur most frequently? - -Overhead lines To reverse the direction of rotation of a three-phase motor, reverse: - -any two leads When can an unqualified person enter the Limited Approach Space? - -***&They are never allowed within the Limited Approach space Cells are connected in series to increase: - -***Voltage rating The three-phase connection in which one end of each of the windings are connected together is called the _____ connection. - -***delta What is the recommended minimum insulation-resistance value for motor windings made before 1970? - -***100 Megohms per kV + 1 A digital multimeter, when set to read voltage, has an input impedance of - -***a fixed, high impedance regardless of range Class 00 rubber insulating gloves are proof tested at 2,500 VAC, what color label would you expect to find on these gloves? - -***White Write three thousand fortyeight tenthousandths in decimal form. - -***0.3048 What is the primary purpose of the National Electrical Code? - -***The practical safeguarding of persons and property from electrical hazards. Each switchboard used as service equipment should be provided with a main bonding jumper. - -***True Harmonics increase the risk of fire and electric shock. - -***True The ________ section of a switchboard receives power from the service section and feeds it to various downstream loads. - -***distribution Three inductors of 60mH, 120mH and 75mH respectively, are connected together in a parallel combination with no mutual inductance between them. Calculate the total inductance of the parallel combination in millihenries. - -***26 mH What is the distance between points (3, 5) and (4, 5) on the rectangular coordinate grid? - -***1 Which of the following sets of terminals would you expect to find on a DLRO? - -***C1, P1, C2, P2 Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division: - -***0.32 The dataplate on a condenser bushing shows values for C2. What do these represent? - -***The power factor and capacitance that should be measured between the tap and the ground flange What does the I represent on a circuit breaker which has a solid state LSIG trip device? - -***Instantaneous The main advantage of aluminum bus bar is: - -***low cost Shown below is a current transformer with the number of turns between taps. What is the calculated voltage for taps X1 to X3 when 200 V is applied to the full secondary winding (X1 to X5)? - -***60V Using the diagram shown, what is the total circuit resistance? - -***10 ohms A given transformer has insulating fluid with a specific gravity greater than 1, from where would you draw a sample? - -top For a DAR test of a transformer, the reading at 1 minute is divided by a reading at: - -***60 seconds Sample valves should be flushed with at least _____ of waste liquid before collecting a transformer liquid sample. - -***one quart Underground service conductors between the terminals of service equipment and service lateral or underground service conductors are termed as _____ . - -***Service Point Conductors In the picture below, would rated ear muffs be adequate hearing protection? - -***no In a zone-interlocked low voltage circuit breaker protection scheme, the trip unit responsible for clearing the fault is inoperative. Which statement is true? - -***The downstream circuit breaker will trip In a purely inductive circuit, the phase angle between the voltage waveform and current waveform will have a _____ phase shift. - -***90 degrees The smallest particle of a substance where it still retains it's properties is a/an______. - -***molecule The breaking capacity of a circuit breaker is usually expressed in: - -Amperes Only qualified workers are allowed within the Limited Approach Boundary. - -***True ***False Which of the following is not a factor in the operating speed of a relay? - -***rate of flux build up A downstream 30A fuse will always blow before an upstream 100A fuse. - -***false Which of the following ratios is equal to the ratio 8:22? - -***4:11 The grounded conductor is one of the two conductors through which normal circuit current flows. - -***False In an inductive circuit, the voltage waveform lags behind the current waveform. - -***False What respirator is used when there is insufficient oxygen in a confined space or area, and where the concentration of airborne substances in immediately dangerous to life and health? - -***Air purifying What color test decal you affix to a protective device that is not suitable for service? - -***Red What is the insulation level of a cable marked MV-90/175mils? - -100% What can change the voltage output of an energized transformer? - -***Load-tap-changer Shielded cables and twisted pairs are used more frequently in communication circuits to reduce mutual coupling. - -***True An electrical hazard/risk analysis only looks at the hazards involved with performing energized work. - -***False In a three-phase connection, the current that flows in a winding is the _____ current. - -***Phase What is the NETA-ATS recommended test voltage for a 15 minute withstand test on a 3-phase, 34.5kV line sectionalizer with a rated impulse withstand voltage of 150kV? - -***78kVAC When measuring voltage with a multirange voltmeter, which one of the following ranges should be applied first? - -***0-1000 V Electromotive force is measured in _____. - -***volts Power Factor equals? - -***Watts / VA What is the minimum oxygen level before entering a transformer? - -***11.5% To make a resistance measurement, start with the ohmmeter set on: - -***The lowest scale When the thermal memory is switched on for digital overcurrent protective devices (OCPDs) used on low-voltage circuit breakers, what effect will it have on the long time delay (LTD) operating time? - -***It will decrease LTD somewhat. Medium-voltage cable, in accordance with NEC Article 328, is defined as single or multiconductor solid dielectric insulated cable rated at ____ volts or higher for use on power systems rated up to 35kV. - -***1001 A 120VDC circuit measures a current of 0.83 amperes, how many watts are in this circuit? - -***145 A given 120VAC 60Hz circuit has a load of 10A with a 20° lagging power factor for 30 minutes. What is the true power? - -****310.58 Watts ***1127.63 Watts The accuracy rating of a specific analog ammeter is +/- 1% of full scale. A measurement is taken at 25% of full scale. The accuracy of this measurement is +/- - -2.5% The sum of the voltage drops around a series circuit is _____? - -Equal to the applied voltage According to NFPA 70E, all circuits must be analyzed for safety. - -***True The first step in circuit breaker operation should be to find and read the _______. - -***Manufacturers instructions Evaluate (1/4)^3. - -***1/64 Polarization index is defined as the ratio of the measured insulation resistance at what two specific times? - -***10 minutes to 1 minute Liquid samples that were drawn when the liquid was below 32 degrees F: - -***May not reveal free water What types of loads cause harmonic distortion? - -***VFD Circuit breakers that stay in service for years without operating: - -Tend to have much lower insulation power factors A 4160V circuit is equipped with 200/5 CTs, at full scale what should the panel ammeter read if the circuit was operating with a power factor of 0.8%? - -200A Identify the electrical symbol shown: - -***Transformer The NEC requires Arc-Flash warning labels on all equipment that may be worked on while energized. - -***True A wye-delta transformer has a primary line voltage of 7200 V and a secondary voltage of 360 V. What is the turns ratio? - -20:1)()()()()()()(