Electrical Apprenticeship Year 2 L8-20 Practice Test

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• What is the purpose of an isolation transformer?
• What is the correct formula for calculating capacitance of a capacitor?
• What is the National Electrical Code (NEC)?
• How can the power factor of an electrical system be determined?
• What happens to the voltage across a capacitor when it is fully charged in a circuit?
• Volts multiplied by amps multiplied by sinθ equals what?
• Is the average power in a purely inductive circuit zero?
• What is a GFCI, and where is it required?
• In electrical circuits, what does "polarity" refer to?
• Which component is primarily responsible for providing inductance in a circuit?
• Name the three primary types of electrical loads.
• What is the formula for calculating the time constant of a circuit in terms of capacitance and resistance?
• What is the typical frequency of AC power in North America?
• True power in a circuit is measured in which unit?
• What does DC working voltage refer to?
• Which of the following values represents magnetic flux in webers?
• Where does a capacitor store its energy?
• What is the symbol for inductive reactance?
• What might cause a flickering light in a residential setting?
• In which situation would you typically use a Ground Fault Circuit Interrupter (GFCI)?
• What is a primary function of a transformer in electrical systems?
• Which of the following best describes capacitive reactance?
• Increasing the length of the magnetic circuit in an inductor affects its inductance how?
• What is another term for true power?
• In AC circuits, what usually causes an increase in current when compared to a DC circuit?
• What is the relationship between inductance and frequency in a circuit?
• The ability of a material to store energy in an electric field is referred to as what?
• Which of the following best describes inductance?
• What should a technician check for when performing a power quality analysis?
• Why are arc fault circuit interrupters (AFCIs) important?
• The primary purpose of an inductor in a circuit is to?
• What happens to the dielectric in a capacitor when it is charged?
• What is the role of a dielectric in a capacitor?
• When a conductor is cut by 2 webers of flux lines in 1 second, what is the induced voltage?
• Does the magnitude of the applied voltage affect the inductive reactance of a circuit?
• Why is proper wire sizing critical in electrical installations?
• What is the letter symbol used to denote mutual inductance?
• What is the primary function of a circuit breaker?
• The apparent power in an electrical circuit is a function of which two quantities?
• How does the spacing of capacitor plates affect its performance?
• What is the unit of electric field intensity?
• What does the abbreviation "cemf" stand for?
• What could a consistent dimming of lights indicate in a home?
• What is a three-way switch used for?
• What is the primary function of a transformer in an electrical circuit?
• What is the primary function of a capacitor in a circuit?
• What happens when the dielectric of a capacitor breaks down?
• What is often a sign of loose connections in an electrical system?
• What is the equation that relates induced voltage to inductance?
• What is the potential consequence of ignoring power quality issues?
• Which device is commonly found in automobile ignition systems using mutual induction?
• Adding a ferrite core to a coil will cause its inductance to increase or decrease?
• Which type of capacitor is known to be polarity sensitive?
• What is meant by the term dielectric strength?
• What property of a capacitor allows it to store electrical energy?
• In what situation is a subpanel used?
• When the current in a RL circuit decreases, what happens to the voltage across the inductor?
• Inductance opposes changes in which quantity?
• How does a circuit breaker differ from a fuse?
• Does reactive power produce heat?
• What does "load shedding" mean in electrical systems?
• Which of the following statements about parallel circuits is true?
• What role does insulation play in electrical wiring?
• Explain the difference between a series and parallel circuit configuration.
• What is the primary function of a power distribution unit (PDU)?
• What is an electrical panel used for?
• What is the primary purpose of a circuit breaker?
• What is the purpose of conduit in electrical installations?
• Tripling the number of turns in an inductor increases the inductance by how many times?
• What is the formula to determine the maximum current in an RC circuit?
• What aspect of power quality is crucial for electrical systems' efficiency?
• Why is continuity testing important in electrical work?
• What does the letter symbol 'L' represent in electrical terms?
• In a transformer, which coil is connected to the supply?
• When checking for power quality, which parameter is NOT typically assessed?
• What does a thermal imaging camera detect in electrical systems?
• During discharging, what happens to the current flow in a capacitor?
• What phenomenon occurs when a radio antenna is placed close to a power line?
• The product of volts and amps is known as what type of power?
• Which of the following is a way to vary the capacitance of a variable capacitor?
• What is the importance of conducting a load calculation?
• What is the unit of measurement for reactance in AC circuits?
• What is meant by "neutral conductor" in electrical circuits?
• What is the function of a voltmeter?
• What defines a "short circuit"?
• Which of the following is a common type of circuit protection device?
• What happens to the current in an inductive circuit when it is switched off?
• What does the installation of a transient voltage surge suppressor (TVSS) accomplish?
• What is the use of PPE in electrical work?
• What is the purpose of a ground rod in electrical installations?
• What does the curved line on the capacitor symbol represent?
• What is electrostatic induction?
• How many time constants does it typically take for current to reach its steady state value in a RL circuit?
• What should be done before handling any capacitor?
• What is the primary goal of the Lockout/Tagout (LOTO) procedure?
• Which of the following is true about the role of a technician in power monitoring?
• Which type of electrical component uses inductance as a primary function?
• What could occur if a neutral wire is broken?
• In a RL DC circuit, as the current rises, what happens to the voltage across the inductor?
• How is capacitance defined?
• Total opposition to the flow of current in an AC circuit is known as what?
• Which statement is correct regarding capacitive circuits?
• Which of the following can indicate an overloaded circuit?
• What is a lighting contactor, and where is it utilized?
• How is total impedance calculated in an AC circuit with resistance and reactance?
• Which material typically has a high dielectric constant?
• Which component in a circuit can be used to store charge temporarily?
• What tool is essential for ensuring electrical safety during installation?
• Define the term "farad."
• What assessment tool is often used for maintaining efficiency in three-phase systems?
• What does a current transformer do?
• What happens to the energy stored in a capacitor during an AC cycle?
• Coulomb's law states that the force between two point electric charges is inversely proportional to what?
• In a purely capacitive circuit, is it true that the average power is zero?
• What safety precautions should be taken before working on live circuits?
• Why is the use of low-voltage wiring important?
• Volts multiplied by amps multiplied by cosθ equals what?
• Which of the following can indicate an overloaded circuit?
• What is the role of a surge protector?
• Why is it essential to check harmonics in electrical systems?
• Which of the following is a method to safely discharge an inductor when opening a circuit?
• In terms of capacitor construction, what does the term "plate area" refer to?
• Where does an inductor store its energy?
• Which condition causes the phase angle in an AC circuit to move closer to 90 degrees?
• What distinguishes single-phase power from three-phase power?
• What is the formula that represents Coulomb's law for electrostatic force?
• What is the main advantage of using conduits?
• Which of the following electrical equipment utilizes the effects of mutual induction?
• The time constant in a capacitive circuit is specifically associated with which types of electrical components?
• What symbol represents the time constant in an electrical circuit?
• What three factors affect the stored charge in a capacitor?
• What is the relationship between voltage and the number of turns in the primary coil of a transformer?
• Define voltage drop and why it is critical to consider.
• What is an electric field?
• After one time constant, the current flowing in an inductive circuit is approximately what fraction of its steady state current?
• What percentage of source voltage is observed in a capacitor after one time constant?
• What is the minimum size of a service entrance conductor for a residential building?
• What is a major health hazard associated with electrical work?
• As the voltage across a capacitor increases, what happens to the current flowing through the circuit?
• How do you know if a circuit is overloaded?
• What is the purpose of using different dielectric materials in capacitors?
• Under what conditions is outdoor electrical equipment most likely to fail?
• What is the term for the time taken for current in an inductive circuit to reach 63.2% of its maximum value?
• How many time constants does it take for the voltage across the capacitor to reach the value of the source voltage?
• What term describes the total opposition to the flow of current in an AC circuit?
• In what type of circuit would you most commonly find inductors utilized?
• After one time constant, what percentage of the source voltage remains in a discharging capacitor?
• In a transformer, the voltage in the secondary winding is proportional to what ratio?
• As the ratio between the capacitive reactance and resistance in an AC circuit increases, what happens to the phase angle?
• What is the unit of reactive power?
• What is the effect of increasing capacitance in an AC circuit?
• What device uses a small DC current to control the flow of a large AC current?
• What does the dielectric constant represent?
• Which of the following can damage a capacitor?
• What is the symbol for capacitive reactance?
• What is a phased power monitor used for?
• Inductive reactance of a coil is proportional to inductance (L) and what other factor?
• The time constant of an inductive circuit is determined by which two parameters?
• What distinguishes direct current (DC) from alternating current (AC)?
• What does a capacitor store as it charges to the source voltage?
• What is the property of an electrical circuit that opposes any change in current?
• What type of electrical load primarily converts electrical energy into heat?
• How often should electrical systems be inspected according to the NEC?
• In an inductive circuit, which factor primarily affects the time constant?
• What unit is used to measure mutual inductance?
• What is the function of a relay in electrical systems?
• What effect does an increase in inductance have on the time constant of a RL circuit?
• What does the term "electromotive force" (EMF) refer to?
• Why is circuit identification important during troubleshooting?
• The capacitive reactance of a capacitor is __________ proportional to capacitance and __________ proportional to frequency.
• How should a wire be properly terminated?
• What does an ammeter measure in an electrical circuit?
• When an inductor is placed in a DC circuit, how does the current draw compare to an AC circuit with the same voltage?
• What is a dielectric?
• What is the formula for calculating the time constant of a RL circuit?
• The relationship between frequency and capacitive reactance can be described as:
• What is the primary function of a capacitor in a circuit?
• What is a ground fault?
• What is a capacitor?
• What is the unit of inductance?
• The Q factor of a coil is the ratio of which two parameters?
• Which of the following is NOT an item of electrical equipment that exhibits inductive properties?
• Which formula correctly calculates the energy stored in a capacitor?
• In a capacitive circuit, the relationship between voltage and current is shown by which of the following?
• Define Ohm's Law.
• What effect does temperature have on the inductance of a coil?
• The time constant in a capacitive circuit is calculated by multiplying which two quantities?