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answers 2025
The state of charge of a lead acid battery is measured by which of the following: - correct answer ✅Hydrometer Temporary safety grounds: - correct answer ✅Are sized with consideration of available short circuit current and time duration Before personnel are allowed to operate a power circuit breaker they must first understand the ________ of the breaker. - correct answer ✅All the above Type MV is a single dielectric insulated cable rated _____ volts or higher. - correct answer ✅ 2001 Which of the following is LEAST likely to contain a blown fuse trip device? - correct answer ✅200 amp fused safety switch An accessory used to allow a circuit breaker to be remotely operated is called a/an _________. - correct answer ✅shunt trip Branch-circuit overcurrent devices in emergency circuits shall be accessible to ______ only. - correct answer ✅authorized persons In a wye connected system, without neutral grounding, zero sequence currents are: - correct answer ✅zero What are the three most common states for network protectors? - correct answer ✅automatic, closed, open
answers 2025
Triangle NAB is as shown. If: AN = BN = 100 and BD = AD and N = 120°, then length BD is: - correct answer ✅86. Contactor coils are present in manual motor starters: - correct answer ✅false Which of the following is not a standard dc power source voltage? - correct answer ✅ 96 The wound-rotor induction motor is popular in industry because it has _____ starting torque and _____ starting current. - correct answer ✅high, low Multiphase delta-delta, 3-wire transformer secondary conductors are not considered to be protected by the transformer primary overcurrent protective device. - correct answer ✅false Why it is required to drain off the stored charge in a capacitor after the supply circuit has been opened. - correct answer ✅personnel safety Using the diagram above, identify a point that would not be energized if voltage was applied to the line bus. - correct answer ✅point 12 The size of the neutral conductor is determined by which of the following: - correct answer ✅unbalanced current
answers 2025
What is the kVA rating of a 3-phase generator rated at 100kW with a 0.9 power factor? - correct answer ✅KVA = W/(1000*PF) The _______ in a series circuit will be equal across each resistor in the circuit. - correct answer ✅current The safety goggles or glasses suitable for electrical work should: - correct answer ✅Be non-conductive The Wheatstone bridge is used to measure - correct answer ✅resistance Even though operating and time characteristics vary between different fuse types and constructions, fuses are intended to operate at their ampere rating. - correct answer ✅false Write three thousand fortyeight tenthousandths in decimal form. - correct answer ✅0. Which of the following is not a typical distribution system? - correct answer ✅Secondary Loop Identify the equipment shown in the picture above - correct answer ✅NWP - Used to protect multiple transformers in parallel A dashpot is used: - correct answer ✅To provide time delays
answers 2025
Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in series to a 400 Hz source. The total XC is - correct answer ✅66.32, Xc = 1/(2pif*C) In high impedance grounding systems, the grounding conductor shall not be smaller than ___ copper and ____ aluminum - correct answer ✅8AWG and 6 AWG Name the hazard involved with placing an electrical system in an electrically-safe work condition - correct answer ✅All the above For HV bushing power factor measurements, the C1 test is conducted using the _____ test mode. - correct answer ✅UST A current limiting fuse: - correct answer ✅Opens circuits in less that 1/4 cycle when certain current magnitudes are reached A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a: - correct answer ✅logic analyzer When a grounding electrode conductor or bonding jumper is connected to a concrete-encased electrode (does not extend on to other types of electrodes that require a larger size of conductor), the grounding electrode conductor is not required to be larger than _____ copper wire. - correct answer ✅4AWG
answers 2025
The invention of the ____ made long distance transmission lines practical. - correct answer ✅Transformer Sudden pressure relays operate on a: - correct answer ✅rapid increase in the main tank The grounded conductor is one of the two conductors through which normal circuit current flows. - correct answer ✅True Which of the following would NOT be part of the test plan for a 50 device? - correct answer ✅Determine time delay at two points on the time current curve The breaking capacity of a circuit breaker is usually expressed in: - correct answer ✅MVA Arcing occurs when a load is switched off because the circuit has: - correct answer ✅High Inductance Retrieving oil samples from the transformer sampling cock is the preferred method because it offers the most convenience and least contamination. - correct answer ✅False What is the most common cause of failure of electrical equipment in service? - correct answer ✅Moisture
answers 2025
The equipment manufacturer should be contacted for recommendations before applying dc withstand maintenance tests to metal-enclosed interrupter switchgear rated above 15kV. - correct answer ✅True A delta connected set of windings has a phase voltage of 100 V. The line voltage is
- correct answer ✅100V Which of the following would best describe the relation between voltage and current for an ac circuit containing resistance and capacitive reactance? - correct answer ✅The current leads the voltage Once placed into service, how often must rubber gloves must be cleaned, inspected and electrically tested? - correct answer ✅Every 6 months In a three-phase connection, the current that flows in an externally connected voltage conductor is the _____ current. - correct answer ✅Line Upon the outbreak of a fire, your first action should be to: - correct answer ✅Alert or alarm A given 120VAC 60Hz circuit has a load of 10A with a 20° lagging power factor for 30 minutes. What is the apparent power? - correct answer ✅1200.00VA, S=IE Insulation resistance must be corrected for? - correct answer ✅Temperature
answers 2025
Line current and phase current are the same in the _____ configuration. - correct answer ✅Wye Electromotive force is measured in _____. - correct answer ✅Volts Non load break cable connectors may be used as a disconnecting means in an emergency situation. - correct answer ✅True In a circuit containing a capacitor, the impressed voltage is _____ with the applied voltage. - correct answer ✅180 degrees Which of the following is least important when choosing the class of surge arrester to be applied on a system: - correct answer ✅operating environment of arrester What does NERC stand for? - correct answer ✅North American Electric Reliability Corporation On a 87 diff relay, the tap screw was found to be loose but tripped. What would cause it to be come loose? - correct answer ✅Inadequate maintenance Capacitance is inversely proportional to which of the following? - correct answer ✅Distance between the plates Thermal relays are often used in: - correct answer ✅motor starters
answers 2025
Inductance of a coil is determined by which of the following physical properties? - correct answer ✅A and C You examine a test instrument commonly used to measure insulation resistance on equipment rated 600V or lower. The output of the test instrument is 1000 volts and the lead connections are? - correct answer ✅none of the above A wattmeter measures: - correct answer ✅Current magnitude times voltage magnitude times % power factor Dual-element fuses have a _____ resistance than ordinary fuses. - correct answer ✅lower When can an unqualified person enter the Limited Approach Space? - correct answer ✅When continuously escorted Which of the following should be achieved with adequate ventilation: - correct answer ✅A,B, and C A delta-connected set of windings has a phase current of 10 A. The line current is - correct answer ✅17.32, 10A times 1. Which component is being measured in the test diagram above? - correct answer ✅A phase
answers 2025
AC dielectric withstand acceptance test voltage of a 15kV delta-wye 500kVA dry- type transformer should not exceed _____ percent of factory test voltage for one minute duration. - correct answer ✅ 75 Voltage regulators have loads connected to the: - correct answer ✅Shunt windings Sudden pressure devices used for transformer protection have _____ characteristics in relation to the pressure rise. - correct answer ✅inverse-time A confined space entry permit must be signed by: - correct answer ✅trained individual acting as entry supervisor Hard hats suitable for the performance of low voltage electrical work, but NOT for higher voltage electrical work, are identified as being: - correct answer ✅Class G A gas likely to be used in an inert-gas system of a power transformer is: - correct answer ✅Nitrogen A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 ohms in each phase. How much is the secondary phase current? - correct answer ✅3.2A
answers 2025
When testing power factor of transformer bushings, NETA-ATS recommends investigating power-factor and capacitance readings that vary from nameplate values. What is the tolerance allowed? - correct answer ✅5% When applying personal protective grounds, which end is attached first? - correct answer ✅the ground end The combined rating of circuit breakers or fuses (service overcurrent protective devices) is permitted to be greater than the ampacity of the service conductors. - correct answer ✅true NEC Article 230.95 requires ground fault protection of equipment for solidly grounded wye electrical services of more than 150 volts to ground, but not greater than 1000 volts phase-to-phase for each service disconnecting means rated ________ amps or more. - correct answer ✅ 1000 In a three-phase motor, the speed of rotation of the magnetic field is called the _____ speed. - correct answer ✅synchronous When evaluating insulation test results on a medium-voltage, air-magnetic circuit breaker, what quantity is evaluated? - correct answer ✅watt-loss The basic requirements for switchgear and switchboards are covered in NFPA 70 article ________. - correct answer ✅ 408 Ventricular fibrillation occurs at currents as low as: - correct answer ✅100mA- 2000mA
answers 2025
One advantage DC type motors have over AC types is that: - correct answer ✅their speed can be easily varied Voltage rated rubber gloves should be inspected and tested for air leaks before each use. - correct answer ✅True Which NFPA standard provides safe work procedures? - correct answer ✅70E What instrument would normally be used to measure the winding resistance of a transformer? - correct answer ✅Kelvin Bridge As built drawings typically include: - correct answer ✅Installation changes What steps must an employer take after determining that the workplace has permit required confined entry areas? - correct answer ✅Develop and implement a written program Cells connected in parallel must have similar internal resistance, ampere-hour ratings and EMF. - correct answer ✅True According to the National Electric Code, a building does not require a single main disconnect providing all circuits served by the building service can be disconnected by no more than how many switches or circuit breakers? - correct answer ✅ 6
answers 2025
Ground fault protection is required by the NEC for all solidly grounded 480Y/277V system breakers rated 1000A or greater. - correct answer ✅False At what voltage level would you VLF test newly installed cable rated 5kV Phase-to- Phase, according to NETA standards? - correct answer ✅10kV When may hard hats be worn backwards? - correct answer ✅Only when properly marked Class 0 rubber insulating gloves are proof tested at 5,000 VAC, what is the AC max use voltage of these gloves? - correct answer ✅ 1000 A de-spiking diode should be connected in _____ with a relay coil. - correct answer ✅Parallel The maximum clearance between 600V nominal individual open conductors shall be ____ according to NEC. - correct answer ✅12 inches A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 ohms in each phase. How much is the primary line current? - correct answer ✅2. High voltage circuit breakers are _________ devices. - correct answer ✅electromechanical
answers 2025
Plastic and glass covers in electrical enclosures are transparent to infrared radiation. - correct answer ✅False Underground service conductors between the terminals of service equipment and service lateral or underground service conductors are termed as _____. - correct answer ✅Service Entrance Conductors What does the L represent on a circuit breaker which has a solid state LSIG trip device? - correct answer ✅Long time delay The service overcurrent device does not protect the service conductors under short-circuit or ground-fault conditions on the line side of the disconnect. - correct answer ✅True A circuit breaker which can be racked in and out has _____ positions. - correct answer ✅four What is the primary purpose of the National Electrical Code? - correct answer ✅The practical safeguarding of persons and property from electrical hazards How often should an extension cord be inspected? - correct answer ✅Every day Which relay is used to protect feeders? - correct answer ✅Translay Relay Power transformer cooling classes went through major changes in the United States when IEEE Standard C57.12.00-2000 adopted the modern four-letter
answers 2025
designation. Which of the following old designations does not match the new? - correct answer ✅OA/FOA = ONAN/ONAF What is the voltage rating of a lead acid battery: - correct answer ✅2.2V There is a guy standing 3 feet and a guy 6 feet away from an exposed live part, how much incident energy is he exposed to compared to the 3 ft guy? - correct answer ✅quater What mode of operation of a power factor set is used for a C1 test? - correct answer ✅UST Calculate the circuit time constant of an inductor having resistance value of 100 ohms and an inductance value of 4 Henry: - correct answer ✅0.04, T = L/R Manual switches controlling emergency circuits shall be convenient to authorized persons responsible for their ______. - correct answer ✅actuation Which type of electromechanical relay is best used when measuring more than one electrical quantity? - correct answer ✅Induction Cup OSHA requires that all ________ be trained in the purpose and use of lock out / tag out procedures. - correct answer ✅affected employees
