Single Phase AC Circuit Amplitude Concepts
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Questions and Answers

What is the relationship between current and voltage in a pure inductive AC circuit?

  • Current leads the voltage by 90 degrees
  • Current is independent of the voltage
  • Current lags the voltage by 90 degrees (correct)
  • Current is in phase with the voltage

    • In an AC circuit containing only a pure capacitor, how does the current behave in relation to the voltage?

  • Current lags the voltage by 90 degrees
  • Current leads the voltage by 90 degrees (correct)
  • Current is independent of the voltage
  • Current is in phase with the voltage

    • What does the total impedance (Z) represent in an RL series circuit?

  • Total electric field
  • The total current flowing in the circuit
  • The total opposition to current flow in the circuit (correct)
  • The power factor of the circuit

    • What is the relationship between current and voltage in an RC series circuit?

    <p>Current leads the voltage by 90 degrees</p> Signup and view all the answers

    What type of circuit is formed when a resistance, inductance, and capacitance are connected together in series?

    <p>RLC Series Circuit</p> Signup and view all the answers

    What is the unit of measurement for impedance in an RL series circuit?

    <p>Ohm</p> Signup and view all the answers

    What happens to a capacitor when a voltage is applied across it?

    <p>It stores electric power</p> Signup and view all the answers

    What does the capacitive inductive reactance (XC) represent in an RC series circuit?

    <p>Capacitive impedance</p> Signup and view all the answers

    In an RLC series circuit, how do the current levels through the resistance, inductance, and capacitance compare to each other?

    <p>Same in all elements</p> Signup and view all the answers

    What happens to a capacitor when the supply in an RC circuit is off?

    <p>It discharges</p> Signup and view all the answers

    What is the term used to describe the highest positive or negative value obtained by an alternating quantity in a single full cycle?

    <p>Maximum value</p> Signup and view all the answers

    What is the term used to describe the shape created by charting the instantaneous values of an alternating variable along the y-axis and time (t) or angle (θ=wt) along the x-axis?

    <p>Sine wave</p> Signup and view all the answers

    The difference between the peak positive value and the peak negative value in a sine wave is known as:

    <p>Peak-to-peak value</p> Signup and view all the answers

    What does 'T' represent in the context of time taken by a voltage or current to complete one cycle?

    <p>Time period</p> Signup and view all the answers

    The collection of positive and negative values that completes a full cycle or travels through 360 degrees electrically is known as:

    <p>One full cycle</p> Signup and view all the answers

    What is the number of cycles per second made by an alternating quantity known as?

    <p>Frequency</p> Signup and view all the answers

    Which term refers to the value of voltage or current at any given time?

    <p>Instantaneous value</p> Signup and view all the answers

    During each complete cycle of an AC signal, how many maximum or peak values are there?

    <p>Two</p> Signup and view all the answers

    What term is used to describe the highest positive or negative value in either the positive or negative direction during one complete cycle?

    <p>Peak value</p> Signup and view all the answers

    What is the term used for the time taken in seconds by a voltage or a current to complete one cycle?

    <p>Time period</p> Signup and view all the answers

    What is the phase angle in a series circuit when XL > XC?

    <p>Positive</p> Signup and view all the answers

    In an RLC series circuit, what happens when XL equals XC?

    <p>The circuit behaves like a purely resistive circuit</p> Signup and view all the answers

    What is the reactance of the inductor in the given series circuit?

    <p>25.13 Ohms</p> Signup and view all the answers

    Which component's voltage leads the current in an RLC series circuit?

    <p>Inductor</p> Signup and view all the answers

    What is the total impedance of the given series circuit?

    <p>354.89 Ohms</p> Signup and view all the answers

    What is the power factor of the circuit?

    <p>0.563</p> Signup and view all the answers

    How does the circuit behave when XL < XC?

    <p>Like an RC circuit</p> Signup and view all the answers

    What happens when VL is greater than VC in the circuit?

    <p>The circuit behaves as an inductive circuit</p> Signup and view all the answers

    What is the power consumed by the circuit?

    <p>98.95 W</p> Signup and view all the answers

    In the RLC series circuit acting as a purely resistive circuit, what can be said about the relationship between current and voltage?

    <p>They are in phase</p> Signup and view all the answers

    What is the formula for the average value of voltage in an AC circuit?

    <p>Vavg = 0.636 Vmax</p> Signup and view all the answers

    In a purely resistive circuit, when does the current reach its maximum value?

    <p>t = 90°</p> Signup and view all the answers

    What is the phase difference between the voltage and current in a pure resistive AC circuit?

    <p>0 degrees</p> Signup and view all the answers

    In a purely inductive circuit, in what relation does the current lag behind the voltage?

    <p>90 degrees</p> Signup and view all the answers

    What is the formula for the average current in an AC circuit?

    <p>Iavg = 0.636 Imax</p> Signup and view all the answers

    What is the value of the root mean square (RMS) in an AC circuit defined as?

    <p>Square root of means of squares of instantaneous values</p> Signup and view all the answers

    What does the peak value represent in an AC circuit?

    <p>The maximum value of the sine wave</p> Signup and view all the answers

    What does the instantaneous value of an AC signal represent?

    <p>The value of voltage or current at one particular instant</p> Signup and view all the answers

    Which formula is used to calculate the phase difference between voltage and current in an inductive circuit?

    <p>I = Vm / XL (sin?dt- p/2)</p> Signup and view all the answers

    What happens to the power in a purely resistive AC circuit?

    <p>Power is dissipated by resistors</p> Signup and view all the answers

    What type of three-phase system has the load equally distributed in all three phases?

    <p>Balanced system</p> Signup and view all the answers

    How are the three equal voltages or EMFs in a 3 phase system separated from each other?

    <p>By a phase difference of 120º</p> Signup and view all the answers

    How are the coils in a three-phase AC generator positioned to produce the three equal voltages?

    <p>Displaced apart by 120 degrees electrical</p> Signup and view all the answers

    What is the phase difference between the three EMFs in a 3 phase system?

    <p>120 degrees</p> Signup and view all the answers

    In which type of three-phase system are the live wires and one return path used?

    <p>Three-phase system</p> Signup and view all the answers

    What angle separates the magnitude of voltage in all three phases of a balanced three-phase system?

    <p>120º</p> Signup and view all the answers

    How are the three identical windings positioned in a three-phase AC generator?

    <p>Displaced apart by 120 degrees</p> Signup and view all the answers

    What is the defining characteristic of a balanced three-phase system when it comes to the load?

    <p>Equally distributed in all three phases</p> Signup and view all the answers

    How does a three-phase system differ from a single-phase system?

    <p>Has three live wires and one return path</p> Signup and view all the answers

    What is the characteristic voltage separation angle between phases in a balanced three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the phase difference between the start terminals a1 and c1?

    <p>270 degrees</p> Signup and view all the answers

    In a 3-phase system, how much of the weight of conducting material is required compared to a single-phase system to transmit the same power?

    <p>75% less</p> Signup and view all the answers

    What is an advantage of a 3-phase motor over a single-phase motor?

    <p>Self-starting</p> Signup and view all the answers

    What is an advantage of a single-phase system over a 3-phase system?

    <p>Can efficiently feed a 3-phase load</p> Signup and view all the answers

    What occurs in a single-phase circuit when the voltage and current are in phase?

    <p>Power is zero twice in each cycle</p> Signup and view all the answers

    What happens to the frequency of vibrations in a 3-phase motor compared to a single-phase motor?

    <p>It is lower</p> Signup and view all the answers

    What occurs in a 3-phase system in terms of torque production compared to a single-phase system?

    <p>Uniform torque is produced</p> Signup and view all the answers

    What is the relationship between the power delivered in a single-phase circuit and in a 3-phase circuit?

    <p>Power delivered is constant in a 3-phase circuit</p> Signup and view all the answers

    How do the power factor and efficiency of a 3-phase induction motor compare to that of a single-phase induction motor?

    <p>Higher power factor and efficiency</p> Signup and view all the answers

    What is the advantage of a 3-phase alternator in terms of size and weight compared to a single-phase alternator?

    <p>Smaller in size and lighter in weight</p> Signup and view all the answers

    What is the defining characteristic of a balanced three-phase system?

    <p>Equal voltage magnitude in all three phases</p> Signup and view all the answers

    How are the three EMFs in a 3 phase system related?

    <p>Equal magnitude but phase difference of 120 degrees</p> Signup and view all the answers

    What happens when the magnetic field is rotated in a three-phase AC generator?

    <p>EMF is induced in each winding</p> Signup and view all the answers

    How are the coils positioned in a three-phase AC generator to produce equal voltages?

    <p>Displaced apart by 120 degrees</p> Signup and view all the answers

    What is the phase difference between the three start terminals a1, b1, and c1 in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the relationship between the three live wires in a three-phase system?

    <p>Equal power transmission</p> Signup and view all the answers

    What is the primary difference between a balanced and unbalanced three-phase system?

    <p>Load distribution</p> Signup and view all the answers

    What is the frequency of the three equal EMFs in a 3 phase system?

    <p>Identical frequencies</p> Signup and view all the answers

    What is the angle of separation between the three identical windings in a three-phase AC generator?

    <p>120 degrees</p> Signup and view all the answers

    What happens to the load in a balanced three-phase system?

    <p>Equally distributed in all three phases</p> Signup and view all the answers

    In a 3-phase system, what is the phase difference between the coil b1b2 and coil a1a2?

    <p>240 degrees</p> Signup and view all the answers

    What is the power delivery characteristic of a single-phase system?

    <p>The power delivered experiences zero values twice per cycle</p> Signup and view all the answers

    What is one of the advantages of a 3-phase induction motor over a single-phase induction motor?

    <p>Greater starting torque</p> Signup and view all the answers

    If the voltage magnitude between the neutral point and the red phase terminal is VR, what is the corresponding magnitude for the yellow phase?

    <p>VY</p> Signup and view all the answers

    What is the outcome of feeding a 1-phase load with a 3-phase system?

    <p>Efficient feeding without any drawbacks</p> Signup and view all the answers

    What is produced in a 3-phase system, as opposed to a single-phase system, in terms of torque?

    <p>Uniform or constant torque</p> Signup and view all the answers

    How does the size and weight of a 3-phase alternator compare to a single-phase alternator?

    <p>3-phase alternator is smaller in size and lighter in weight</p> Signup and view all the answers

    What is the relationship between the frequency of vibrations in a 3-phase motor and a single-phase motor?

    <p>3-phase motor has a lower frequency of vibrations</p> Signup and view all the answers

    Why does a single-phase motor require auxiliary means to start?

    <p>There is a lack of starting torque</p> Signup and view all the answers

    How does a 3-phase system differ from a single-phase system in terms of dependency?

    <p>Single-phase system can depend on 3-phase, but not vice versa</p> Signup and view all the answers

    What is the defining characteristic of a balanced three-phase system?

    <p>Equal distribution of load across all three phases</p> Signup and view all the answers

    How are the three identical windings positioned in a three-phase AC generator?

    <p>Displaced apart by 120 degrees</p> Signup and view all the answers

    What is the phase difference between the three phase voltages in a balanced three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the relationship between the magnitudes of voltage in a balanced three-phase system?

    <p>Equal voltages in all phases</p> Signup and view all the answers

    What type of system is one where the load is not equally distributed in all three phases?

    <p>Unbalanced three-phase system</p> Signup and view all the answers

    In a balanced three-phase system, what is the phase separation between the voltages?

    <p>120 degrees</p> Signup and view all the answers

    What happens when the loading is not evenly spread across the three phases in a three-phase system?

    <p>Generation of harmonics</p> Signup and view all the answers

    What must happen to the load in a balanced three-phase system for it to remain balanced?

    <p>Equal distribution in all three phases</p> Signup and view all the answers

    What is the primary advantage of a balanced three-phase system compared to an unbalanced system?

    <p>Equal voltage magnitude in all phases</p> Signup and view all the answers

    How do the phase angles differ between the three equal EMFs in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What happens to the emf induced in the coil a1a2?

    <p>It is zero and increasing</p> Signup and view all the answers

    In a balanced three-phase system, what is the phase difference between coil b1b2 and coil a1a2?

    <p>120 degrees</p> Signup and view all the answers

    Why are three-phase induction motors considered self-starting?

    <p>They have no starting torque</p> Signup and view all the answers

    What is a key advantage of three-phase over single-phase systems regarding power delivery?

    <p>Power is almost constant</p> Signup and view all the answers

    In a 3-phase AC generator, what happens to the emf induced in the coil c1c2?

    <p>It is positive and increasing</p> Signup and view all the answers

    Why are 3 phase alternators smaller in size and light in weight compared to single-phase alternators?

    <p>Due to higher power factor</p> Signup and view all the answers

    What happens to the torque produced in a 3 phase system compared to a single-phase system?

    <p>Constant or uniform torque is produced</p> Signup and view all the answers

    How does the frequency of vibrations in a 3 phase motor compare to a single-phase motor?

    <p>It is lower</p> Signup and view all the answers

    What is the main advantage of using a 3 phase system over a single-phase system for power transmission?

    <p>Less need for conducting material</p> Signup and view all the answers

    Why do 3 phase systems require less copper and aluminium in transmission compared to single-phase systems?

    <p>Because they have a wider field of applications</p> Signup and view all the answers

    In a three-phase system, what is the phase difference between coil a1a2 and coil b1b2?

    <p>90 degrees</p> Signup and view all the answers

    What is the main advantage of a three-phase system over a single-phase system for power transmission?

    <p>Lower voltage drop</p> Signup and view all the answers

    Why are three-phase induction motors considered self-starting?

    <p>They produce uniform torque</p> Signup and view all the answers

    What is the effect of load imbalance on a balanced three-phase system?

    <p>Unbalanced voltages</p> Signup and view all the answers

    What aspect of power delivery makes three-phase systems superior to single-phase systems?

    <p>Constant power delivery</p> Signup and view all the answers

    What is the frequency of vibrations like in a three-phase motor compared to a single-phase motor?

    <p>Lower</p> Signup and view all the answers

    Which system requires less copper and aluminium for transmission: three-phase or single-phase?

    <p>Three-phase</p> Signup and view all the answers

    What is the main difference between a three-phase and a single-phase induction motor?

    <p>Starting torque</p> Signup and view all the answers

    In a balanced three-phase system, what type of torque is produced?

    <p>Uniform torque</p> Signup and view all the answers

    What significantly reduces the weight of conducting material needed in a three-phase system?

    <p>Balanced three-phase loads</p> Signup and view all the answers

    What type of system is a balanced three-phase system?

    <p>One with equally distributed load in all three phases</p> Signup and view all the answers

    How are the three voltages or EMFs in a 3 phase system related?

    <p>Equal magnitudes with 120 degrees phase difference</p> Signup and view all the answers

    What happens when the windings of a three-phase AC generator are stationary?

    <p>Emf is induced in each winding</p> Signup and view all the answers

    How are the three coils positioned in a three-phase AC generator?

    <p>Displaced 120 degrees apart from each other</p> Signup and view all the answers

    What is the phase separation angle between the three coils in a 3 phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is indicated by three identical windings in a three-phase AC generator?

    <p>Three equal voltages with a 120 degree phase difference</p> Signup and view all the answers

    What defines a balanced three-phase system in terms of voltage magnitude?

    <p>Equal voltage magnitudes in all phases</p> Signup and view all the answers

    In a 3 phase system, what happens when the magnetic field rotates around stationary windings?

    <p>Induction of emf in each winding</p> Signup and view all the answers

    What occurs when the phase difference between three EMFs is 90 degrees in a 3 phase system?

    <p>Phase separation of 180 degrees</p> Signup and view all the answers

    What angular separation results in equal voltages in a 3 phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the key feature of a balanced three-phase system?

    <p>Equal distribution of loads in the three phases</p> Signup and view all the answers

    How are the voltages or EMFs in a three-phase system related?

    <p>Equal magnitudes and 120 degrees phase difference</p> Signup and view all the answers

    What is the angle of separation between the windings in a three-phase AC generator?

    <p>120 degrees</p> Signup and view all the answers

    How does the phase difference vary between the three EMFs in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the result of rotating the magnetic field in a stationary three-phase AC generator?

    <p>EMFs are induced in each winding</p> Signup and view all the answers

    What type of torque is produced in a balanced three-phase system?

    <p>Balanced torque</p> Signup and view all the answers

    What happens to the three EMFs when they are produced by a three-phase AC generator?

    <p>Equal magnitude and frequency with 120 degrees phase difference</p> Signup and view all the answers

    How do the starting and finishing terminals of identical coils differ in a three-phase system?

    <p>The starting terminals come before the finishing terminals</p> Signup and view all the answers

    What is the relationship between the magnitude and frequency of EMFs in a three-phase system?

    <p>Equal magnitudes and frequencies</p> Signup and view all the answers

    What is the phase separation between the three live wires in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the angular speed at which the three coils are rotated to induce EMFs?

    <p>$2.5\pi$</p> Signup and view all the answers

    In a balanced star system, what is the relationship between the magnitude of the phase voltage and the magnitude of the line voltage?

    <p>Line voltage is $\sqrt{3}$ times the phase voltage</p> Signup and view all the answers

    What is an advantage of a three-phase induction motor over a single-phase motor?

    <p>Is smaller in size and lighter in weight</p> Signup and view all the answers

    In a three-phase system, what happens to the frequency of vibrations compared to a single-phase system?

    <p>Decreases</p> Signup and view all the answers

    How does the power delivered in a single-phase system compare to a three-phase system?

    <p>Power is zero twice in each cycle in single-phase</p> Signup and view all the answers

    What is the impact of load imbalance on a balanced three-phase system?

    <p>Unbalances the three-phase system</p> Signup and view all the answers

    How do the size and weight of a three-phase alternator compare to a single-phase alternator?

    <p>Small in size and lighter in weight</p> Signup and view all the answers

    What type of torque is produced in a single-phase system compared to a three-phase system?

    <p>Constant torque in three-phase, pulsating torque in single-phase</p> Signup and view all the answers

    What does a 3-phase system require less of in comparison to a single-phase system for power transmission?

    <p>Less conducting material</p> Signup and view all the answers

    How does the 3-phase system handle dependency compared to the single-phase system?

    <p>A 3-phase system cannot depend on a single-phase system</p> Signup and view all the answers

    What is the distinguishing factor between a balanced three-phase system and an unbalanced three-phase system?

    <p>The magnitude of voltage in the phases</p> Signup and view all the answers

    How are the three EMFs in a 3-phase system produced?

    <p>By rotating the coils</p> Signup and view all the answers

    In a 3-phase system, what happens when the magnetic field is rotated around stationary windings?

    <p>Generates EMF in each winding</p> Signup and view all the answers

    What is the phase difference between the 3 equal voltages or EMFs in a 3-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What are the start and finish terminals of three identical coils in a 3-phase system denoted as?

    <p>A1, B1, and C1; A2, B2, and C2</p> Signup and view all the answers

    What happens to the magnitude of the voltages in a balanced three-phase system?

    <p>They stay the same in all three phases</p> Signup and view all the answers

    How are the three live wires of a three-phase system related?

    <p>They are in-phase with each other</p> Signup and view all the answers

    What effect does unbalancing the load have on a balanced three-phase system?

    <p>Causes uneven distribution of current</p> Signup and view all the answers

    What is the main reason for dividing a three-phase system into a balanced and unbalanced system?

    <p>To ensure equal current flow in all phases</p> Signup and view all the answers

    What is the phase angle separation between the three live wires in a balanced three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the magnitude and direction of the induced emf in the coil c1c2, as per the analysis in figure C?

    <p>Positive and decreasing as shown in the waveform</p> Signup and view all the answers

    In a balanced star system, what is the relationship between the magnitude of the voltage across the red phase terminal and the voltage across the blue phase terminal?

    <p>Equal magnitudes</p> Signup and view all the answers

    What is the advantage of a three-phase induction motor over a single-phase induction motor in terms of starting characteristic?

    <p>Single-phase motors have higher initial torque</p> Signup and view all the answers

    How does the frequency of vibrations in a 3 phase motor compare to that in a single-phase motor?

    <p>Lower in 3 phase motor</p> Signup and view all the answers

    When comparing the size and weight of a three-phase alternator to a single-phase alternator, what is true?

    <p>Three-phase alternator is smaller and lighter</p> Signup and view all the answers

    What happens in terms of power delivery when comparing a single-phase and three-phase system?

    <p>Three-phase system delivers constant power</p> Signup and view all the answers

    What is the primary advantage of a three-phase system in terms of the economy of power transmission?

    <p>Requires less conducting material than a single-phase system</p> Signup and view all the answers

    What characteristic distinguishes three-phase induction motors from single-phase induction motors regarding starting torque?

    <p>Three-phase motors are not self-starting</p> Signup and view all the answers

    How do the weight requirements of copper and aluminum differ between 3 phase and single-phase transmission systems?

    <p>Three-phase system requires less copper/aluminum</p> Signup and view all the answers

    How does a balanced three-phase system ensure torque production compared to a single-phase system?

    <p>Balanced three-phase system provides constant torque</p> Signup and view all the answers

    What kind of system is one in which the loads are equally distributed in all three phases?

    <p>Balanced system</p> Signup and view all the answers

    In a 3-phase system, what is the magnitude of voltage like in all three phases?

    <p>It remains the same.</p> Signup and view all the answers

    How much apart are the three EMFs in a 3-phase system separated by?

    <p>120 degrees</p> Signup and view all the answers

    What occurs when the magnetic field is rotated in a stationary three-phase AC generator?

    <p>Increase in voltage</p> Signup and view all the answers

    What is the phase difference between coil a1a2 and coil c1c2 in a 3-phase system?

    <p>60 degrees</p> Signup and view all the answers

    How are the voltages or EMFs in a 3 phase system produced?

    <p>By three-phase generators</p> Signup and view all the answers

    What is the relationship between the magnitude and frequency of the EMFs in a 3-phase system?

    <p>Same magnitude and same frequency</p> Signup and view all the answers

    What happens when the three identical coils in a 3-phase system have starting terminals a1, b1, and c1?

    <p>Produce voltages with the same frequency</p> Signup and view all the answers

    What type of system is used for transmitting a large amount of power?

    <p>Three-phase system</p> Signup and view all the answers

    What is the angle separation between the magnitudes of each phase in a balanced three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    In a three-phase system, what phase difference has to be maintained between the start terminals a1, b1, and c1?

    <p>120 degrees</p> Signup and view all the answers

    What is the power factor of three phase induction motors compared to single-phase induction motors?

    <p>Higher</p> Signup and view all the answers

    How does the power delivery vary between single-phase circuits and polyphase systems?

    <p>Pulsating in polyphase systems</p> Signup and view all the answers

    What is one advantage of three-phase induction motors over single-phase induction motors?

    <p>Provide self-starting abilities</p> Signup and view all the answers

    What is the relative dependency between a single-phase load and a three-phase system?

    <p>Single-phase load can depend on a 3 phase system</p> Signup and view all the answers

    What is the difference in torque production between a three-phase system and a single-phase system?

    <p>Uniform torque in three-phase system</p> Signup and view all the answers

    How does the weight of conducting material needed for power transmission compare between three-phase and single-phase systems?

    <p>Single-phase requires more weight</p> Signup and view all the answers

    What is one reason why three-phase induction motors have a wide field of applications in industries?

    <p>Self-starting ability</p> Signup and view all the answers

    What frequency of vibrations is experienced in a three-phase motor compared to a single-phase motor?

    <p>Lower frequency</p> Signup and view all the answers

    What is the angular separation between the three EMFs in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is a key characteristic of a balanced three-phase system?

    <p>Equal distribution of loads in all phases</p> Signup and view all the answers

    How are the three EMFs produced in a three-phase system?

    <p>By a three-phase AC generator with windings displaced by 60 degrees</p> Signup and view all the answers

    What phase difference exists between the three EMFs in a three-phase system?

    <p>120 degrees</p> Signup and view all the answers

    What is the phase separation angle between the coils in a three-phase AC generator?

    <p>120 degrees</p> Signup and view all the answers

    In a balanced three-phase system, how do the magnitudes of voltage in all three phases compare?

    <p>They are the same with a phase difference of 120 degrees</p> Signup and view all the answers

    What happens when a three-phase AC generator has stationary windings and a rotating magnetic field?

    <p>EMFs are induced in each winding</p> Signup and view all the answers

    What is the relationship between the phases in a balanced three-phase system?

    <p>Equal magnitudes of current in all phases</p> Signup and view all the answers

    What distinguishes a balanced three-phase system from an unbalanced one?

    <p>Equal distribution of loads in all phases</p> Signup and view all the answers

    How are the windings positioned in a three-phase AC generator?

    <p>Stationary with a fixed magnetic field</p> Signup and view all the answers

    What is the phase angle separation between the finish terminals of three identical coils in a three-phase generator?

    <p>120 degrees</p> Signup and view all the answers

    What is the angular speed of rotation in radians per second mentioned in the text?

    <p>$360$</p> Signup and view all the answers

    What is the phase difference between coil c1c2 and coil a1a2 in degrees?

    <p>$240$</p> Signup and view all the answers

    In a balanced star system, what happens to the magnitudes of current and voltage?

    <p>They are the same</p> Signup and view all the answers

    Compared to a single-phase system, how is the power transmitted in a three-phase system described?

    <p>Constant power delivery</p> Signup and view all the answers

    What characteristic makes three-phase induction motors self-starting as mentioned in the text?

    <p>High power factor</p> Signup and view all the answers

    In a 3 phase system, what is the magnitude of torque produced?

    <p>Variable torque</p> Signup and view all the answers

    What is a benefit of a three-phase alternator over a single-phase alternator?

    <p>Larger size</p> Signup and view all the answers

    What is different about the frequency of vibrations in a single-phase motor compared to a three-phase motor?

    <p>No vibrations in three-phase</p> Signup and view all the answers

    Which system can efficiently feed a single-phase load but cannot be fed by a single-phase system?

    <p>Three-phase system cannot depend on single-phase system</p> Signup and view all the answers

    Why is a three-phase system considered superior to a single-phase system in terms of power transmission economy?

    <p>More weight of conducting material required</p> Signup and view all the answers

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