4th Year Lineman Apprentice Practice Exam

These questions are part of the practice quiz. Start practicing

• What is the primary purpose of electromagnetic detectors in cable testing?
• What unit measures "real" power?
• What is a key difference between a "Scott" transformer and a "Conventional" transformer?
• What insulation medium is used for cables over 45 kV?
• A transformer that is additive in polarity has a coil voltage of what value?
• What term describes the opposition to current flow in a direct current circuit?
• What capacity does a sectionalizer have to interrupt?
• What must be done to the exposed open ends of underground cable during construction?
• What property of an alternating current circuit opposes changes in voltage?
• According to Blondel's Theorem, how many stators are required to properly meter a service with multiple wires?
• What unit measures Reactive power?
• What is one of the primary disadvantages associated with underground power systems?
• What should be inspected for damage during daily checks of rubber gloves?
• How much is the Kw power load for a circuit with a 13,200 system voltage, 30 amps, and a power factor of 85%?
• What is the primary reason for grounding the tank of the transformers?
• What is the primary cause of low power factor in overhead systems?
• What procedure can inadvertently reverse the direction of rotation of a customer's three-phase motor?
• Why are underground secondary faults considered easier to locate?
• What is the primary function of a booster transformer?
• Which of the following best defines 'maximum demand' in electrical consumption?
• What is the unit of measure for inductance?
• During which condition is a transformer bank likely to experience issues related to ferro-resonance?
• When calculating the wattmeter multiplier, if a potential transformer is rated at 14400/120, what value is obtained?
• Voids within the high voltage insulation of underground cable can lead to failure due to what reason?
• How do you determine the wattage being processed by a circuit using the multipliers derived from transformers?
• In an underground electrical system, a looped design is chosen for which of the following reasons?
• What is the typical sequence of operations for OCR's protected by fuses?
• What is the primary function of a sectionalizer in an electrical circuit?
• What is the fuse size required for the 50 kVA transformer bank?
• What is the calculated value of the hypotenuse in the given scenario?
• Mechanical and thermal meters are types of what?
• Why is burying junk pieces of wire in trenches forbidden for line personnel?
• What is the normal low-side rating of a current transformer?
• Which of the following is NOT classified as an underground test device?
• Which type of power does inductance relate to in alternating current circuits?
• A 4 wire configuration on the high side of the system indicates which type of system?
• What mechanism is used to measure electrical energy in a building?
• Which transformation type would decrease voltage from a high level to a lower level?
• What type of underground electric system has a single source of feed?
• Which insulation type is not known for high flexibility but provides good thermal resistance?
• What is the assembly used to connect an overhead line to an underground line known as?
• If a voltmeter connected to a 14,400 volt bus reads 120.8 volts, what is the voltage on the bus?
• What is the formula for calculating capacitive reactance?
• What advantage does plastic have for high voltage insulation on underground cables?
• What general classification of power cables is designed to prevent leakage and external interference?
• What unit is used to measure capacitive reactance?
• What type of circuit allows power to flow in one path only?
• What is the reactive load in the same overhead circuit rated at 300 Kva with a real power load of 240 Kw?
• At what power rating does the transformer bank operate?
• What is the primary function of fuses in a transformer bank?
• What is the Kva power load for a system voltage of 240 with a balanced current load of 150 amps and a power factor of 80%?
• Phase transformation can be accomplished by the use of:
• What term refers to the cooperation between utilities for cost sharing?
• True or False: The main difference between a boost and buck transformer connection is the reversal of the series winding connections.
• Is it possible to use potential transformers without current transformers for metering purposes?
• What is the minimum safe working distance phase to phase for system voltages up to 15,000 volts?
• What is the unit of measure for real power in an electrical system?
• What is considered the most reliable underground electrical service?
• What is the total opposition to current flow in an alternating current circuit called?
• How many fuses are required for the transformer bank described?
• Which unit measures metered energy?
• If an overhead circuit has a total apparent power of 300 Kva and a real power load of 240 Kw, what is the percentage power factor?
• Which method is typically required for fault localization in cable systems?
• Which of the following best describes True Power?
• What does the term "dead front" refer to in electrical equipment?
• What is the potential risk of not addressing ferro-resonance in transformer systems?
• What is the connection type of a 7200 3-phase 3-wire 50 kVA transformer?
• What is the function of a potential transformer in a high voltage circuit?
• Which multiplier is used for calculating voltages in a three-phase system?
• How does the high side line current compare to the coil current in a wye bank?
• What is the calculated fuse size for the transformer bank?
• What is the calculated high side coil current for the 50 kVA transformer?
• How would you calculate the inductive reactance of a 53.08 millihenry inductor in a 60 cycle circuit?
• Which of the following is a measure of electrical resistance?
• Which unit of measure represents "real" power?
• Which condition applies when linemen can safely work on different phases simultaneously?
• What is the connection type of a 13800 3-phase 4-wire 10 kVA transformer?
• Which configuration is indicated for the transformer bank connection?
• Which term is used to describe electricity consumption patterns over a specific period?
• What device sends pulses into a cable to display reflections caused by changes in electric characteristics?
• Which unit is used to measure apparent power?
• Which component in an electric motor is mainly responsible for generating rotational motion?
• What are the two general classifications of power cables?
• What is the current multiplier for a current transformer (CT) rated at 200/5?
• What is the most common cause of faults in underground systems?
• What does the load factor represent in electrical terms?
• Which of the following is a medium commonly used for insulation in high-voltage cables?
• What is the formula for calculating inductive reactance?
• What term describes the total opposition to current flow in an alternating current circuit?
• How often should rubber gloves be inspected while in use?
• Which of the following is classified as a reactive load?
• Which grounding technique is primarily used for safety in electrical systems?
• What function does a "sacrificial anode" serve in underground electrical apparatus?
• An overhead electric distribution system typically contains which type of reactive power?
• What is the unit of measure for both capacitive and inductive reactance?
• What is the unit of measure for inductive reactance?
• What is an essential function of storm pumps in manhole drainage?
• What is the maximum number of automatic sectionalizing devices that can be placed in series on a single phase circuit?
• Which situation is more likely to create ferro-resonance in a transformer bank?
• What is the unit of measure for capacitance?
• What is the high side line current for the 50 kVA transformer?
• What unit is used to measure resistance?
• What procedure is used to ensure a sacrificial anode is in proper operating condition?
• To calculate the fuse for a transformer, what multiplier is used?
• Which of the following devices indicates depth of a cable?
• Why is oil and gas-filled cable considered more practical for high voltage applications?
• Which component is commonly involved in cost-sharing agreements between utilities?
• What is the multiplier used in the calculation of voltages on a two-phase system?
• What does an increase in impedance typically affect in an AC circuit?
• What is the term used for the product of voltage and current in electrical systems?
• What type of underground electric system has secondary mains supplied by multiple primary feeders?
• What is the total current in a 14,400 volt overhead circuit with a power rating of 300 Kva and a real power load of 240 Kw?
• How is the high side coil current calculated for the 50 kVA transformer?
• Which part of a motor consists of three single-phase windings spaced 120 degrees apart?
• What procedure is used when a transformer rated meter becomes overloaded?
• Autotransformers with ratios no greater than 2-1 are more efficient and have less harmonic distortion. True or False?
• What is the resulting impedance when a 40-ohm resistor is added in series to the circuit?
• Which device is essential for proving that a cable is de-energized?
• What unit measures "apparent" power?
• In electrical terms, what is the usual definition of 'capacity'?
• What type of metal is installed in the ground and connected to a submersible transformer's tank to prevent corrosion?
• What method is used for alignment during the erection of steel on concrete pads?
• What device is used to measure high resistance in cables?
• What type of equipment uses a hand-driven generator?
• What device on a kilowatt-hour meter counts the revolution of the rotating element?
• What primarily causes a low power factor in underground systems?
• In an aerial device, where is the preferred point for attaching the lanyard of a body belt?
• If the high side of an autotransformer is supplied with 2400 volts, what is the low side voltage if formed by tapping from one end of the coil to the center?
• What is the multiplier used to calculate the fuse for a capacitor?
• What is the minimum bending radius of secondary underground cable in relation to its diameter?
• What type of circuit consists of a resistance and a capacitance?
• What type of power is indicated by the term 'vars'?
• System voltage is defined as which value of the electrical system?
• What is an example of the unit of measure of real demand load?
• How is the polarity of instrument transformers classified?
• What phenomenon is likely to occur if a transformer bank is not loaded adequately during operation?
• What is the power stored in reactance known as?
• Which term accurately describes a method of locating faults underground by using signals?
• Which of the following is a potential symptom of ferro-resonance?
• In terms of electrical circuits, what does the symbol 'X' represent?
• Which term describes the amount of electricity used at any given moment?
• Total opposition to current flow in an alternating current circuit is referred to as?
• Which of the following are classified as instrument transformers?
• What are the two basic types of underground faults?
• What metal is commonly used for sacrificial anodes on underground equipment?
• With regard to electrical safety, what does the term "joint" refer to in utility contexts?
• What type of transformer can be used to electrically isolate?
• What type of connection is more likely to create ferro-resonance while switching?
• What is another name for a bottom connected meter?
• What kind of humming is typically associated with transformers under certain conditions?
• What is a major factor that reduces the reliability of underground systems?
• In the context of transformers, what does CT stand for?
• Why is the second source of supply significant in critical electrical loads?
• What multiplier is used to calculate high side line current from coil current in a delta connection?
• What is the high side coil voltage of the 50 kVA transformer?
• How many fuses are required for the specified bank?
• What term is used for an underground room intended for pulling and splicing cables?
• Which trigonometric function is utilized for solving 'z' in a right triangle?
• For proper function, what property should transformers have regarding their cooling methods?
• What is the unit of measure for apparent power?
• What is the normal low-side rating of a potential transformer?
• What is the high side coil voltage for the 13800 3-phase 4-wire 10 kVA transformer?
• What type of transformer is used to increase voltage on a feeder by 5 or 10 percent?
• Is bending too sharply during installation the only way an air void can be created in an underground cable?
• How is the high side coil voltage represented in electrical engineering standards?
• At what Kvar rating does a capacitor bank require a vacuum or oil switch for sectionalizing?
• What is the primary effect of placing temporary grounds on the floated neutral of a transformer bank during switching?
• What does a step-up transformer do to the current for economical power transmission?
• What is the primary purpose of stranding conductors?
• Where can you find the minimum and maximum fault current values?
• At a power factor of 100%, what is the relationship between real load and total load?
• How do you calculate the high side coil current for the 13800 3-phase 4-wire 10 kVA transformer?
• Which device is specifically designed to indicate when fault currents have passed through?
• What do we call power that is dissipated by resistance, measured in watts?
• What does the register in a kilowatt-hour meter track?
• What is the primary function of primary reading meters?
• A circuit with excessive inductance is typically classified as which type?
• What term refers to work done and measured in kilowatt-hours?
• What is the situation called when the capacitance of a cable cancels the inductive effect of a transformer?
• Given a system voltage of 13,200 with a balanced current load of 30 amps and a power factor of 85%, what is the Kva power load?
• In a lightly loaded secondary side of a transformer bank, what is more likely to occur under ferro-resonance conditions?
• What is the significance of the right triangle method in electrical circuits?
• Which cable type is rated at 5000 volts and features helically wrapped paper tapes around the conductor?
• Which cable insulation has superior resistance to heat deformation and environmental stress cracking?
• What is the measure of the angle in the right triangle described?
• If a 100 Kvar capacitor is installed in the circuit, what will be the new power factor?
• What type of cable insulation is typically used for low voltage applications?
• Which instrument is used to measure electrical resistance?
• What trigonometric function is used to solve for the angle of a right triangle?
• What is the calculation for determining the required fuse size?
• What is the measurement unit for metered reactive load?
• What threshold is often applied to the calculated fuse size for safety considerations?
• What type of load would generally require a 3-phase transformer connection?
• Which term refers to the measure of total opposition to current flow in a circuit?
• What term refers to the highest demand measured over a specified period?
• Which method is commonly used for draining manholes?
• What does the process of confirmation ensure on a faulted circuit?
• When a transformer rated meter is changed due to overload, what is this process commonly known as?
• What is the biggest disadvantage of an underground electrical system?
• In the context of metering, which term is related to the highest demand recorded?
• What is a significant disadvantage of concentric underground cables?
• Which device is used to secure electrical equipment against tampering?
• True or False: A dead front transformer contains exposed live parts.
• Which type of cable is less affected by moisture due to its sealed nature?
• What is the unit of measure for reactive power?
• Fault indicators are placed behind which components?
• What term refers to the highest of the average load during a metering period?
• Which term refers to the rate at which work is being done in an electrical context?
• What is the purpose of a manhole in underground systems?
• Which wire type is often indicated for a phase 4-wire transformer bank?
• How is the potential coil connected in a typical meter setup?
• Zinc is considered a sacrificial metal to which material?
• What electrical phenomenon can lead to inefficiencies in power distribution due to a concentrated current flow?
• What does the minimum fault current value represent at a sectionalizing point?
• What is one reason to regularly check the status of potential and current transformers?
• How does the current flow pathway through the body potentially affect safety?
• What type of signaling known as 'impedance' does an AC circuit encounter?
• What is the effect of reversing two phases of a three-phase motor?
• In what unit is impedance measured?
• Is it necessary for a dissimilar metal to be connected to a cable for corrosion to occur on that underground cable?
• What type of transformer setup could provide electrical isolation for safety purposes?
• What method is used to calculate total impedance in an alternating current circuit?
• What effect do autotransformers have on harmonic distortion in electrical systems?
• How many fuses does the 50 kVA transformer bank require?
• Is the path of current flow more likely to take the path of the dermis layer than the epidermis?
• Which type of current flow opposes rapid changes due to its inductive nature?
• What is the typical unit for measuring frequency?
• What does 'R' represent in the impedance calculation formula?
• Which formula is used to calculate impedance?
• Are all three-phase motors considered "induction" running motors?
• What term relates to the phenomenon where current is conducted near the surface of an alternating current conductor?
• If a potential transformer (PT) is rated at 14400/120, what is the potential multiplier?
• How are the windings within a motor commonly connected?
• What is the leading cause of underground cable failures?
• Which unit is used for measuring "reactive" power?
• What type of cable insulation is made of closely woven cotton cloth coated with insulating varnish and rated from 600 to 23000 volts?
• Which factors can lead to faults in underground wiring systems, apart from human error?
• How must electrical equipment be made to protect the public from tampering?
• For a system voltage of 240, 3-phase with 150 amps and a power factor of 80%, what is the Kw power load?
• What is the primary objective of fault location on overhead and underground systems?
• What is a common characteristic of an induction motor?
• When two linemen are working from an elevated position, must they work on the same phase at one time?
• What size of submersible transformers requires the use of an open grating for proper ventilation and cooling?
• What are the two classifications of underground fault locating equipment?
• Under what condition would a transformer rated at 120/240 or 240/480 have internal connections?
• Which of the following statements is true regarding overhead and underground fault location?
• The measure of which electrical characteristic opposes current flow due to changes in voltage is called what?
• How is the high side coil current calculated?
• When removing capacitors rated over 600 volts, how long should you wait before grounding and shorting out terminals?
• What is the recommended practice when sectionalizing a "floated" wye transformer bank under conditions of ferro-resonance?
• What is the primary purpose of a sacrificial anode?
• What is the process of determining the type of fault called?
• What is the minimum bending radius of primary underground cable in relation to its diameter?
• An autotransformer would be practical in which of the following applications?
• What does the "Class" of a meter indicate?
• What characteristic of an alternating current circuit opposes changes in current?
• What is the value of current that can cause fibrillation of the heart?
• What is the resulting fused size when multiplying the calculated current by 1.25?
• What does a megohmeter specifically measure?
• What fuse size would be required for the capacitor when calculating the new power factor with a 100 Kvar capacitor?
• What is the effect of increased capacity on capacitive reactance?
• For a specific value of voltage, what relationship exists between current and resistance?
• Which type of meter must carry the entire load current through the meter?
• Which formula is used to calculate the current from the transformer's KVA rating and voltage?
• What is the primary purpose of instrument metering?
• What is the minimum diameter for handlines used in electrical work?
• Why are the secondary side connections of transformers typically grounded?
• What type of meter is designed to register actual readings?
• What happens in a circuit on the secondary side of a current transformer (CT) with an open connection on a fully loaded line?
• How is the relationship between true power and apparent power expressed?
• What component is crucial in preventing electrical overload situations?
• What is the minimum acceptable test voltage for a good sacrificial anode?
• Which of the following factors is NOT a determinant of the rate of activity between two dissimilar metals?
• Are OCR's on taps rated in adjacent sizes allowed to drop down by two sizes?
• What is the purpose of a conductor shield in a cable?
• What is a system designed for critical loads with a second source of supply?
• What does a demand meter measure?
• What is the potential difference between two dissimilar metals in an electrolyte primarily dependent on?
• What describes a chemical reaction within an electrolyte that leaves a metal with excess electrons?
• Which configuration is used to increase the starting torque of a three-phase motor?
• What does the diversity factor measure?
• What is an assembly containing both the potential and current coils called?
• Which device is commonly used to measure high currents?
• What factor is used to size fuses in relation to the load current?
• What is the high side line current as per the calculations?
• What is a key characteristic of a radial circuit?
• What term describes the opposition to current flow due to a change in voltage or current?
• What can be said about the quality of reactive power?
• Which type of meter typically records energy consumed for billing purposes?
• What is the calculated high side coil current for the 13800 transformer?
• Which measurement is most associated with electrical power consumption?
• What should be monitored when dealing with the secondary side of a transformer?
• What is the unit of measure for impedance?
• What does a 3 wire configuration on the high side of the system indicate?