NEIEP Electrical Fundamentals (360) Practice Test

These questions are part of the practice quiz. Start practicing

• What makes up one cycle?
• A sine wave with a peak value of 169.73 V has an RMS value approximately what?
• What is the power formula in an AC circuit?
• If a sine wave starts 30 electrical degrees before another, what is it called?
• In a delta-connected system, the line current relates to the phase current by which factor?
• The effective value is often abbreviated as what?
• Which waveform gradually rises and abruptly falls, or vice versa?
• For an ideal transformer, how are voltages and currents related to the turns ratio?
• When a magnetic field consists of two poles, how many times does the induced voltage switch polarity per revolution?
• What power in watts is consumed by a 100 ohm resistor connected to 120 VAC?
• In an RC series circuit driven by a sinusoidal source, which steps correctly determine the magnitude of the resistor voltage using phasors?
• 0.005 s to go from zero to 90 degrees; frequency?
• How do you compute the total resistance of two resistors in parallel?
• How does the stored energy in a capacitor change with capacitance and voltage?
• The time for one complete cycle is called?
• Which quantity is used to compute the heating effect of current in AC circuits?
• In an electromagnetic field, the lines of flux form what shape?
• In a balanced three-phase system with V_LL = 480 V, I_L = 20 A, and cos φ = 0.8, which pair best represents active and apparent power?
• What symbol represents the net reactance in a series R-L-C circuit?
• What is the peak-to-peak value?
• What is the output frequency of a 4-pole rotor turning at 1800 rpm?
• In a purely resistive circuit, what is the phase angle between voltage and current?
• In a purely inductive circuit, how does current relate in phase to voltage?
• In electrical power systems, what is the standard frequency used in the United States?
• If two resistors in parallel are 6 Ω and 3 Ω, what is the total resistance?
• Which quantity is zero when averaging over a full cycle?
• If the turns ratio a = N_p / N_s = 2 and the secondary impedance Z_s is 9 Ω, what is the primary impedance Z_p reflected to the primary?
• What term is used for the peak value of a sine wave?
• In a series R-L-C circuit at resonance, what happens to the impedance?
• What best describes a square wave?
• In an inductive circuit, which quantity leads the other?
• To reflect a transformer's secondary impedance to the primary side, which formula is used?
• What is the primary functional difference between a fuse and a circuit breaker?
• Which device detects unequal current between hot and neutral and disconnects power?
• What happens to total resistance and source current when more resistors are added in parallel?
• In AC circuits, what happens to inductive reactance as frequency increases?
• A circuit having 120 VAC at 5 A with 0 degrees phase shift, the power would be what?
• What type of waveform has equal horizontal sections at two fixed voltage values and equal instantaneous rise and fall times?
• The peak value of an AC sine wave is how many times its RMS value?
• The DC equivalent of an AC sine wave is:
• RMS value of a voltage whose peak value is 312 V.
• A resistor of 63 ohms is connected to a sinusoidal source with a peak voltage of 74 V. What is the average power dissipated?
• Which statement defines Kirchhoff's Voltage Law?
• In a two-resistor parallel network, which expression gives the current through resistor R1 (I1)?
• What is the correct expression for the impedance of a capacitor in AC circuits?
• If a sinusoidal voltage has a peak value of 424.2 V, what is its peak-to-peak value?
• The frequency of an AC signal is inversely related to what other quantity?
• In a balanced three-phase system, the line-to-line voltage is what factor times the line-to-neutral voltage?
• In a series circuit, which statement is true about current and voltages across components?
• In a voltage divider with Vin = 12 V, R1 = 2 kΩ, R2 = 3 kΩ, what is V_out across R2?
• Peak value of a sine wave whose RMS is 120 V.
• What is the impedance magnitude Z for the same series circuit (V = 120 V, R = 30 Ω, X_L = 20 Ω)?
• The effective value (RMS) of an AC sine wave is how many times the peak value?
• Line-to-neutral voltage is what times the line voltage?
• For a circuit with 120 VAC, 5 A and 20-degree phase shift, the real power is approximately what?
• In a three-phase system, the line-to-line voltage is how many times the line-to-neutral voltage?
• What is the frequency corresponding to a period of 0.04 seconds?
• Which term best describes theta in the AC power formula?
• If the primary-to-secondary turns ratio of an ideal transformer increases while the secondary voltage is held fixed, what happens to the primary voltage?
• For a sine wave with a peak value of 120 V, what is the peak-to-peak value?
• In a series R-L-C circuit, increasing frequency affects XL how?
• What is the inductive reactance formula?
• For a three-phase balanced load, what is the real power formula?
• A conductor moving through a magnetic field passes through lines of flux, inducing a current in the wire. What is this phenomenon called?
• If system impedance increases, what happens to fault current magnitude?
• How is a sine wave created?
• If N_p : N_s = 4 : 1 and V_p = 480 V in an ideal transformer, what are V_s and the current ratio I_s : I_p?
• Period 0.02 s; frequency?
• Which component is commonly used to improve power factor in electrical systems?
• A four-pole generator completes one revolution. How many cycles are produced?
• Which statement correctly describes apparent power?
• What describes the pattern of flux lines around the center of a two-pole magnetic field?
• In a wye-connected three-phase system, which relation between line-to-line voltage and line-to-neutral voltage is true?
• What is the period of a waveform and how is it related to frequency?
• What is the time of each pulse or half-cycle commonly called?
• For a sine wave, what is the relationship between peak and RMS values?
• The rotating fields of an alternator make up what?
• Which statement about the relationship between period and frequency is correct?
• What is the formula for reactive power in a circuit with voltage, current, and phase angle?
• The time required for once cycle is called what?
• What is inrush current when energizing inductive loads, and which mitigation methods are commonly used?
• Define apparent power, real power, and reactive power and their units.
• What is the average value of 65 volts RMS?
• Which term describes the high-voltage conductor that should be avoided for control circuits in a high-leg delta?
• In a four-pole AC generator, how many cycles per mechanical revolution are produced by a single loop?
• Which equation is the standard phasor form of Ohm's law connecting voltage, current, and impedance?
• What will happen if an ACB controller is connected in ABC phase sequence?
• Which statement is true about the relationship between average and peak value for a sine wave?
• The average voltage is what multiplied by the peak value of one alternation?
• What device can be used to detect a condition of reversed phase and prevent a motor from operating?
• Which statement describes a triangular wave?
• Which of the following is a correct form of Ohm's Law?
• The number of AC cycles per second is called the what?
• A sine wave has a period of 0.0083 seconds. What is its frequency?
• Which practice best enhances arc-flash safety when working on electrical equipment?
• Period of a 40 Hz waveform?
• Peak-to-peak value is equal to what multiple of the peak value?
• What is the average value of one complete cycle if the positive and negative alternations are the same?
• Which statement defines Kirchhoff's Current Law?
• In a parallel circuit, what is true about voltage and currents in branches?
• What is the typical color for neutral conductors in the United States?
• Which is the primary purpose of a motor starter coil and its contacts?
• In RC circuits, how does the total impedance change as frequency increases?
• How can you increase the output power or wattage of an alternator?
• What is the line-to-line voltage if the line-to-neutral measures 120 VAC?
• A two-pole AC generator produces how many cycles of AC voltage each time the armature makes one revolution?
• If the effective current is 3.5 A, what is the peak-to-peak value of the applied AC current?
• For a sine wave with a peak value of 230 volts, what is the average value?
• What happens to motor rotation if the phase sequence is reversed?
• Which statement characterizes a rectangular wave?
• If the sine waves of voltage and current pass through zero at the same instant and peak at the same instant, they are in what condition?
• Why must you be very careful when connecting a single-phase line to the neutral of a controller supply?
• The three-phase system has each sine wave displaced how far from the others?
• What is the period of a 60 Hz waveform?
• What is the peak value of an AC voltage whose RMS value is 300 V?
• What is the capacitive reactance formula?
• Which quantity is used to compare AC heating to DC heating?
• In an inductive circuit, which quantity leads?
• What happens when the magnetic field consists of two poles?
• The peak value equals what times the RMS value for a sine wave?
• Which formula represents reactive power as Q = I^2 × X with X = X_L − X_C?
• What does RMS stand for?
• What is the formula used to determine frequency?
• RMS value of an AC voltage measuring 340 V peak-to-peak.
• What is the unit commonly used to express frequency?
• If frequency is 60 Hz, period?
• In a wye-connected system, if the line-to-line voltage is 480 V, what is the line-to-neutral voltage approximately?
• Which statement describes a sawtooth wave?
• In the power formula p = E x I x cos theta, what is cos theta when the voltage and current are in phase?
• An AC voltage has an average (mean) value of 72 V. Its RMS value is approximately what?
• How many cycles are produced by a 20-pole alternator rotor in making one revolution?
• If a sine wave starts 30 electrical degrees after another, what is it called?
• What is the typical color coding for grounding conductors in the United States?
• A circuit having 120 VAC at 5 amps with 20 degrees phase shift would equal what?
• If a sine wave is produced by a rotating loop in a magnetic field, what waveform is observed?
• The number of electrical degrees between one sine wave and another is known as what?
• For a sine wave with peak value 424.2 V, its RMS value is approximately which?
• What terminal is created when a stator is connected in a wye configuration and the three ends are joined?
• A period is the time required for what?
• If I_total = 6 A flows into parallel resistors R1 = 2 Ω and R2 = 3 Ω, what is I1 (current through R1)?
• If two resistors in series are 4 Ω and 6 Ω, what is the total resistance?
• What is the term used for the maximum voltage or current reached during one alternation?
• Define peak and RMS values for a sine wave.
• What is the RMS value corresponding to a peak of 230 V?
• How do you compute the total resistance of two resistors in series?
• If line-to-neutral voltage is 120 V in a three-phase system, what is the line-to-line voltage?
• In AC circuits, what happens to capacitive reactance as frequency increases?
• What is power in electrical terms and its unit?
• If a sine wave has a peak voltage of 100 V, what is its average value?
• What is power factor and how is it calculated?
• What is the unit of impedance?
• How many cycles are produced by a 2-pole rotor in one full revolution?
• Express the impedance of a series R-L-C circuit in complex form.
• In a capacitive circuit, which quantity leads?
• Which statement correctly describes peak-to-peak value in relation to peak for a sinusoidal signal?
• What is the difference between grounding and bonding?
• In the real power formula for a three-phase balanced load, which factor accounts for the phase difference between voltage and current?
• Which units are used to express frequency?
• The RMS value of AC current is defined as the current that would produce the same heating as a direct current.
• To measure current with a multimeter, where should the meter be placed in the circuit?
• Which statement is true about RMS values for sine waves?
• What is the formula to find the peak value from the average value?
• The average value of one half-cycle is what fraction of the peak value?
• What is the output frequency of an alternator with a 12-pole rotor turning 3000 rpm?
• In a series R-L-C circuit, increasing frequency affects XC how?
• The voltage level in alternating current can easily be changed how?
• In a delta-connected three-phase system, which statement about voltages is true?
• If the period is T, what is the frequency relation?
• What is the average value of an AC voltage whose peak value is 120 volts?
• How do you calculate the average value of one half-cycle for a sine wave?
• Which formula describes the energy stored in a capacitor?
• In a voltage divider with two resistors R1 and R2 in series, V_out across R2 equals which expression?
• Period of a 25 Hz signal?
• Power factor improvement aims to move cos φ toward which value?
• What is the phase angle φ between voltage and current for the series circuit (R = 30 Ω, X_L = 20 Ω)?
• What is the peak value of 65 volts RMS?
• If RMS value is 300 V, the peak value is about?
• How do you compute the impedance magnitude from R and net reactance?
• How many cycles of AC voltage are produced by a four-pole generator completing one revolution?
• When the stator ends are connected to form a delta configuration, what configuration is formed?
• For a series circuit with V = 120 V, R = 30 Ω, and X_L = 20 Ω, the current magnitude is approximately which value?
• What does ICE stand for?
• If a sine wave has a peak value of 295 V, what is the average value?
• When using a rotating field to generate electricity, from where is the output voltage taken to supply the load?
• In an alternator, the stationary armature is called what?
• If XL > XC in a series R-L-C circuit, the net reactance is what type?
• What is the standard frequency for AC electric power supplied by utility companies in the US?
• Which equation correctly expresses the peak value in terms of the average value?
• If an effective voltage is 100 VAC, what is the peak value?
• The peak-to-peak value of an AC voltage whose RMS value is 190 V?
• What stator configuration results when the winding ends are paired together to form a closed loop?
• For a sine wave, the peak value is equal to the RMS value multiplied by which factor?
• Which formula expresses the period in terms of frequency?
• Which formula describes the power in a resistive AC circuit in terms of RMS voltage and resistance?
• What is the basic function of a multimeter?
• In a sawtooth waveform, where is the zero reference point located?
• In a parallel circuit, what is true about branch voltages and branch currents?
• If a period is 0.00125 s, what is the frequency?
• Which unit is the SI unit for voltage?
• If a sine wave has an average value of 90 V, the peak value is approximately what?
• If the RMS current is 20.2 A, what is the peak value?
• If the peak current is 16.5 A, what is the average?
• Peak value of an AC voltage whose average value is 140 volts?
• In an alternator, which component rotates to induce current in the stator?
• For an ideal transformer with turns ratio N_p : N_s = 4 : 1, which statement about the current ratio I_p : I_s is correct?
• If one cycle lasts 0.5 seconds, what is the frequency?
• What is the peak value of a sine wave with RMS 50 V?
• What does the term phase relate to?
• What is the formula for three-phase apparent power in a balanced system?