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Questions and Answers
What is the peak value of the source voltage?
What is the peak value of the source voltage?
To increase the current in a series RL circuit, what should be done to the frequency?
To increase the current in a series RL circuit, what should be done to the frequency?
What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor and a 4.7 kΩ resistor?
What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor and a 4.7 kΩ resistor?
In a parallel RL circuit, when the frequency is decreased, what happens to the impedance?
In a parallel RL circuit, when the frequency is decreased, what happens to the impedance?
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What is the total admittance of a circuit with a 470 Ω resistor and a 200 mH coil across a 1.5 kHz ac source, in polar form?
What is the total admittance of a circuit with a 470 Ω resistor and a 200 mH coil across a 1.5 kHz ac source, in polar form?
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What is the current through a 470 Ω resistor and a coil with 125 Ω inductive reactance in parallel across a 15 V ac voltage source?
What is the current through a 470 Ω resistor and a coil with 125 Ω inductive reactance in parallel across a 15 V ac voltage source?
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A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. How does the series configuration affect the overall impedance?
A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. How does the series configuration affect the overall impedance?
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What is ZTH if R1 is changed to 220 Ω?
What is ZTH if R1 is changed to 220 Ω?
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What is the lower frequency if the resonant frequency is 14 kHz with a bandwidth of 4 kHz?
What is the lower frequency if the resonant frequency is 14 kHz with a bandwidth of 4 kHz?
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What is the critical frequency of an RL low-pass filter with a 5.6 mH inductance and a 3.3 kΩ resistor?
What is the critical frequency of an RL low-pass filter with a 5.6 mH inductance and a 3.3 kΩ resistor?
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What effect does a lower value of Q have in a series resonant band-pass filter?
What effect does a lower value of Q have in a series resonant band-pass filter?
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What voltage will the capacitor charge to when a 6 V pulse is applied to the integrator?
What voltage will the capacitor charge to when a 6 V pulse is applied to the integrator?
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At the critical frequency of a low-pass filter, what is the output voltage if the maximum output voltage is 15 V?
At the critical frequency of a low-pass filter, what is the output voltage if the maximum output voltage is 15 V?
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What is the effect of increasing the load impedance in a circuit with an open circuit voltage of 6.67 –33.7° kΩ?
What is the effect of increasing the load impedance in a circuit with an open circuit voltage of 6.67 –33.7° kΩ?
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Which response should be considered to understand how the output voltage is shaped by a differentiator?
Which response should be considered to understand how the output voltage is shaped by a differentiator?
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What happens to the time constant if the capacitor in an integrator becomes leaky?
What happens to the time constant if the capacitor in an integrator becomes leaky?
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If the open circuit voltage is maintained while varying R1, what happens to the overall voltage across the load?
If the open circuit voltage is maintained while varying R1, what happens to the overall voltage across the load?
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When two currents are in the same direction in a branch of a circuit, what is the net current at that instant?
When two currents are in the same direction in a branch of a circuit, what is the net current at that instant?
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In a parallel resonant band-pass filter, if the bandwidth is increased while keeping the resonant frequency the same, what is the likely outcome?
In a parallel resonant band-pass filter, if the bandwidth is increased while keeping the resonant frequency the same, what is the likely outcome?
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To determine the Thevenin equivalent voltage ZTH for a circuit with R equal to 15 kΩ and RL equal to 38 kΩ, which value could potentially be correct?
To determine the Thevenin equivalent voltage ZTH for a circuit with R equal to 15 kΩ and RL equal to 38 kΩ, which value could potentially be correct?
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If an integrator has a leaky capacitor, how is the waveshape of the output voltage across C affected?
If an integrator has a leaky capacitor, how is the waveshape of the output voltage across C affected?
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Which of the following currents can be expected in a circuit where one current flows into a junction and another flows out?
Which of the following currents can be expected in a circuit where one current flows into a junction and another flows out?
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What value would the output voltage drop to when an integrator receives pulses while taking into account potential leakage?
What value would the output voltage drop to when an integrator receives pulses while taking into account potential leakage?
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What is the Thevenin equivalent current ($I_{TH}$) between terminals A and B?
What is the Thevenin equivalent current ($I_{TH}$) between terminals A and B?
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What voltage level is reached by the output during the pulse?
What voltage level is reached by the output during the pulse?
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What is the value for the equivalent voltage source given IS = 4 uA and RS = 1.2 MΩ?
What is the value for the equivalent voltage source given IS = 4 uA and RS = 1.2 MΩ?
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When a 15 V input pulse is applied to an RC integrator, what voltage does the capacitor charge to after two time constants?
When a 15 V input pulse is applied to an RC integrator, what voltage does the capacitor charge to after two time constants?
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What type of filter does an RC differentiator primarily act as?
What type of filter does an RC differentiator primarily act as?
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In an RL differentiator, when the input pulse transitions from low to high, what effect does the inductor have?
In an RL differentiator, when the input pulse transitions from low to high, what effect does the inductor have?
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What component values are specified for the integrator circuit mentioned?
What component values are specified for the integrator circuit mentioned?
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What happens to the voltage across the inductor during the rising edge of the pulse in an RL differentiator?
What happens to the voltage across the inductor during the rising edge of the pulse in an RL differentiator?
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In a three-wire Y-connected generator with phase voltages of 2 kV, what are the magnitudes of the line voltages?
In a three-wire Y-connected generator with phase voltages of 2 kV, what are the magnitudes of the line voltages?
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What is the unit of flux density?
What is the unit of flux density?
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What relation do the phase voltage and corresponding load voltage have in a Δ-connected source feeding a Y-connected load?
What relation do the phase voltage and corresponding load voltage have in a Δ-connected source feeding a Y-connected load?
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What do you call the property of a magnetic material where magnetization change lags behind the application of a magnetizing force?
What do you call the property of a magnetic material where magnetization change lags behind the application of a magnetizing force?
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What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m^2, and a permeability of 2500 µWb/At·m?
What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m^2, and a permeability of 2500 µWb/At·m?
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In a Y-Y source/load configuration, how do the phase current, line current, and load current relate in each phase?
In a Y-Y source/load configuration, how do the phase current, line current, and load current relate in each phase?
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Which electromagnetic device features a movable iron core known as a plunger?
Which electromagnetic device features a movable iron core known as a plunger?
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What is the polarity of induced voltage while a magnetic field is collapsing?
What is the polarity of induced voltage while a magnetic field is collapsing?
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What is the total capacitance of two 0.68 uF capacitors connected in series?
What is the total capacitance of two 0.68 uF capacitors connected in series?
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What happens to the voltage across a capacitor when the plate area increases?
What happens to the voltage across a capacitor when the plate area increases?
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What is the current through each of two 1.2 kΩ resistors connected in series aiding across two 6 V batteries?
What is the current through each of two 1.2 kΩ resistors connected in series aiding across two 6 V batteries?
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How is the total power dissipation calculated in a parallel circuit where each branch dissipates 1.2 W?
How is the total power dissipation calculated in a parallel circuit where each branch dissipates 1.2 W?
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What is the value of each resistor when ten volts are applied across four equal-value resistors connected in parallel, resulting in a 2 mA current from the source?
What is the value of each resistor when ten volts are applied across four equal-value resistors connected in parallel, resulting in a 2 mA current from the source?
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What is the approximate current through each bulb if the filament resistance of each bulb is 1.8 kΩ connected in parallel across a 110 V source?
What is the approximate current through each bulb if the filament resistance of each bulb is 1.8 kΩ connected in parallel across a 110 V source?
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How does the stored charge change when the voltage across a capacitor is tripled?
How does the stored charge change when the voltage across a capacitor is tripled?
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What is the percentage of total voltage across a 47 Ω resistor in a simple circuit if it is connected in series with a certain load?
What is the percentage of total voltage across a 47 Ω resistor in a simple circuit if it is connected in series with a certain load?
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Study Notes
Multiple Choice Questions on Basic Electricity
- Electrical Charge Unit: Coulomb
- Energy Sources: Generator, solar cell, battery.
- Outer Orbit Electrons: Valence electrons
- Variable Resistor: Rheostat/Potentiometer
- Current and Coulombs: 2.5 A current = 2.5 Coulombs per second.
- Resistor Colour Bands: Yellow, violet, red, gold for 4,700 ohm, 10% tolerance.
- Insulator: Material resisting current flow.
- Capacitors in Parallel: Total capacitance = sum of individual capacitances.
- Capacitive Reactance and Resistance: If capacitive reactance equals resistance, voltage is equal across both. Increased frequency=capacitive reactance decreases.
- Capacitance (Q/V): Calculated by dividing charge by voltage.
- Capacitive Reactance (formula): 1/(2 * pi * f * C)
- Polarized Capacitor: Electrolytic capacitor.
- Time Constant (RC circuit): Calculated by multiplying resistance by capacitance.
- Inductors in Series: Total inductance = sum of individual inductances.
- Inductors in Parallel: Reciprocal of total inductance is sum of reciprocals.
- Voltage across a coil(formula): L*(di/dt)
- Frequency and Inductor Current: Decreasing frequency decreases current.
- Parallel Inductors & Reactance: In a parallel inductor circuit, the total reactance is less than the individual reactances.
- Ohmmeter Reading: Zero ohms indicates a shorted inductor.
- Series Resistors and Total Resistance: Total resistance increases when adding a resistor in series.
- Series Circuit's Voltage Drop: The total voltage drop in a series circuit is equal to the source voltage.
- Series Voltage Divider: Voltage drop across each resistor is proportional to its resistance.
- Ammeter Shunt: Shunt resistor is used to prevent excessive current in ammeter's movement.
- Parallel Resistors and Total Resistance: Total resistance decreases when adding a resistor in parallel.
- Parallel Circuit's Current: Total current is divided among branches inversely proportional to their resistance.
- Parallel Resistor Current: current through a resistor in a parallel circuit can vary if the resistance value of the other resistors change.
- Parallel and Series Combination with Load: The output voltage of a voltage divider can be affected by loading, with larger load resistors having more impact.
- Wheatstone Bridge: Used to measure unknown resistances based on a balanced circuit.
- Voltmeter Loading: Higher voltage range settings provide lower loading on circuit.
- Effects of adding resistor in parallel Circuit: decreasing the total resistance.
- Series Resistors and Voltmeter Readings: Zero voltage across resistors except one indicates a voltage drop across that resistor.
More ECE Questions
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Parallel Lights and Current: If one light burns out, the others remain illuminated with the same brightness.
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Series and Parallel Resistor Combinations: The total resistance of parallel and series resistor combination is calculated.
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Voltage Divider and Load: Load resistors affect the output voltage of a voltage divider.
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Multiple Resistor Combinations: Calculating voltage division and current in combinations of series and parallel resistors.
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Wheatstone Bridge and Resistor Values: Calculating unknown resistance in Wheatstone bridges.
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Current Source Values: Converts current source into voltage source and vice-versa.
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Integrator RC Circuit Response: Capacitor charges to a value depending on the applied pulse and time constant.
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Integrator Circuit Parameters: The capacitor charging in an RC integrator is determined by the input pulse width and the RC time constant.
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RL Integrator: Capacitor charges with a time constant according to the frequency input.
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RC Integrator: Input pulse width is affecting the capacitor's charging and discharging rate.
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RL Differentiator: Response to rising and falling pulse edges shows different output waveforms.
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Time Constants and RC Integrator: Pulse width affects how much a capacitor charges or discharges in an RC integrator circuit.
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RC/RL Differentiator: The output waveform is shaped by the rise/fall times of pulse.
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Pulse Width and Time Constant: These factors determine a capacitor’s charging status.
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Thevenin Equivalent Resistances: Calculating total resistance value of components.
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Current Source to Voltage Source Equivalent Circuit: Finding equivalent voltage source from equivalent current source and vice-versa.
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Response of Capacitor During Pulse: A capacitor’s charging/discharging status.
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RC/RL Circuits and Pulse Waveforms: Assessing characteristics of capacitors and inductors involved with pulse waveforms.
More ECE Details
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Multiple Capacitors and Total Capacitance: Calculating total capacitance value when there are multiple capacitors in series.
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Capacitor Values and Reactance: How change in capacitor and frequency affects its reactance.
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Inductive and Capacitive Reactance, Resonance: Inductive and capacitive reactances and how they affect the resonant frequencies.
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Frequency Response Curves and Filters: Understanding how a frequency response curve is related to filters, determining the type of filter that the graph represents.
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Phase Angles in Circuits: The phase angle between sine waves and how the changes in phase affects the circuit.
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Ohm's Law and AC Circuits: Calculating values based on ohm's law in AC circuits.
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Voltage Divider Output: Calculating output voltage based on the values of input voltage and load resistance.
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Multiple Current Source Circuit: Calculating total current in a multiple current source circuit.
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Load Resistance and Voltage Divider: Calculating output voltage for specific load resistors in a voltage divider circuit.
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Thevenin/Norton Equivalent Circuit: Calculating Thevenin voltage and resistance or Norton current and resistance for a given circuit.
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Single-Phase/Three-Phase Systems: Discussing electrical properties of single-phase and three phase systems, such as current, voltage, and power generation.
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Three-Phase System Parameters: In a balanced three-phase load, there is zero current in the neutral line and load voltages.
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Inductor Current: Using different formulas to evaluate current value, inductive reactances, impedance etc.
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Resistor Circuit Properties: Discussing properties like phase angle, bandwidth, etc, of resistors involved in a circuit.
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Filter Characteristics: Understanding filter characteristics: high-pass filter, low-pass filter, band-pass filter.
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Frequency and Circuit Impedance: How the changes in frequency will change the impedance of the circuit.
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Circuit Impedances: Evaluating impedance magnitude and phase of a given circuit with different components.
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Power in Circuits: The power calculations in different circuits to assess how much power is consumed by specific components.
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Multiple components in Parallel or Series: Calculating the values of components connected in parallel or series.
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Three Phase Load and Neutral Current: Calculating the neutral current under balanced and unbalanced three-phase conditions.
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Voltage Divider Circuits with Loads: Analyzing voltage divider circuit response to load changes.
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Multi-Source Circuit: Finding the currents through branches in a circuit using different theorems.
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Balanced/Unbalanced Circuits and Load: Calculating and analyzing current under balanced and unbalanced conditions in a circuit.
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Electromagnetism and Magnetic Fields: Discussing electromagnetic and magnetic field topics such as flux density, reluctance, and hysteresis.
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Magnetism and Electromagnetic Devices: Understanding parameters of magnetism and relevant electromagnetic devices, such as speakers, generators, and relays.
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Three-Phase Systems and Voltage Phase Relationship: Relationships between voltages and currents in three-phase systems (Y-connected and A-connected).
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Three Phase Currents in Various Systems: Analyze how current is affected in different scenarios, such as A-connected and Y-connected scenarios in a three-phase system.
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Description
This quiz covers various concepts related to AC circuit analysis, including the calculation of peak voltage, phase angle, impedance, and current through parallel and series RL circuits. Test your knowledge on resonant frequency, critical frequency, and admittance in different circuit configurations.
