CH 8: Electrical machines - generators and motors
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Questions and Answers

What is the primary function of a generator?

  • To convert electrical energy into mechanical energy
  • To amplify electrical signals
  • To store electrical energy
  • To convert mechanical energy into electrical energy (correct)

    • What is the underlying principle behind the operation of a motor?

  • Faraday's law
  • The motor effect (correct)
  • Lenz's law
  • Electromagnetic induction

    • Which of the following is true about the coil/armature in an AC or DC generator?

  • It remains stationary within the magnetic field
  • It rotates within the magnetic field to induce an EMF (correct)
  • It generates a constant DC voltage
  • It is not involved in the energy conversion process

    • What is the primary function of the magnetic field in a generator?

    <p>To interact with the current-carrying conductor and induce an EMF</p> Signup and view all the answers

    How does the direction and magnitude of the induced EMF in a generator depend on the changes in magnetic flux linkage?

    <p>They are determined by Faraday's law and Lenz's law</p> Signup and view all the answers

    What is the key difference between the energy conversion process in a generator and a motor?

    <p>Generators use electromagnetic induction, while motors use the motor effect</p> Signup and view all the answers

    How do the principles of electromagnetic induction and the motor effect relate to the operation of generators and motors?

    <p>Electromagnetic induction is used in generators, while the motor effect is used in motors</p> Signup and view all the answers

    What is the main purpose of the magnetic field in a motor?

    <p>To interact with the current-carrying conductor and create a force that causes motion</p> Signup and view all the answers

    How does the setup of a generator determine whether it produces AC or DC?

    <p>The setup of the coil/armature and magnetic field determines whether the generator produces AC or DC</p> Signup and view all the answers

    How does the motor effect relate to the torque generated in a motor?

    <p>The motor effect is used to convert electrical energy into mechanical energy, which generates torque</p> Signup and view all the answers

    What component is responsible for conducting current between stationary wires and rotating parts in a generator?

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

    In an AC generator, what mechanism ensures the continuous flow of alternating current without changing direction?

    <p>Slip Rings</p> Signup and view all the answers

    Which rule determines the direction of the force in a coil carrying current within a magnetic field?

    <p>Fleming's Left-Hand Rule</p> Signup and view all the answers

    What is the main function of a commutator in a DC generator?

    <p>Ensure continuous rotation by reversing connection with the external circuit</p> Signup and view all the answers

    Where is the magnetic field typically established in electrical machines like generators and motors?

    <p>Around the coil/armature</p> Signup and view all the answers

    What is the primary function of slip rings in an AC generator?

    <p>Allow continuous flow of current without reversing direction</p> Signup and view all the answers

    Which type of motor is commonly used in household appliances like fans and washing machines?

    <p>AC Motor</p> Signup and view all the answers

    In a generator, what is the main principle behind the conversion of mechanical energy into electrical energy?

    <p>Faraday's law</p> Signup and view all the answers

    What determines whether a generator produces alternating current (AC) or direct current (DC)?

    <p>Changes in magnetic flux linkage</p> Signup and view all the answers

    How does the motor effect contribute to the operation of electrical motors?

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

    What phenomenon occurs when a coil rotates within a magnetic field in a generator?

    <p>Induction of electromotive force</p> Signup and view all the answers

    Which rule dictates the direction of the force experienced by a current-carrying conductor placed in a magnetic field?

    <p>Fleming's left-hand rule</p> Signup and view all the answers

    What is the primary role of the commutator in a DC generator?

    <p>Maintaining current direction</p> Signup and view all the answers

    When a coil rotates within a magnetic field, what law governs the direction and magnitude of the induced electromotive force?

    <p>Lenz's law</p> Signup and view all the answers

    Which component in generators rotates within the magnetic field to induce electromotive force?

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

    "Torque is generated in motors due to ________________."

    <p>&quot;Interaction between magnetic fields&quot;</p> Signup and view all the answers

    What component ensures that current flows in the correct direction to maintain rotation in a DC motor?

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

    In an AC generator, what is the primary function of slip rings?

    <p>Transfer induced current out</p> Signup and view all the answers

    What ensures that the current continuously flows without changing direction in an AC generator?

    <p>Slip Rings</p> Signup and view all the answers

    Which mechanism is employed by a DC generator that results in producing a direct current?

    <p>Commutator splitting the ring</p> Signup and view all the answers

    In a motor, what creates force when current flows through the coil in a magnetic field?

    <p>Armature/Coil</p> Signup and view all the answers

    What is the primary role of brushes in electrical machines like generators and motors?

    <p>Conduct current between wires and rotating parts</p> Signup and view all the answers

    Which component carries current within the magnetic field, inducing rotation in motors?

    <p>Magnetic Field</p> Signup and view all the answers

    "Real-life Applications" section mentions that motors are essential for what types of electrical appliances and machines?

    <p>Household and industrial applications</p> Signup and view all the answers

    In a generator, the direction of the induced electromotive force (emf) is determined by which principle?

    <p>Faraday's law of electromagnetic induction</p> Signup and view all the answers

    What is the primary mechanism responsible for the continuous flow of alternating current in an AC generator?

    <p>Slip rings</p> Signup and view all the answers

    Which component in a DC motor ensures that the current flow is reversed at specific intervals, allowing for continuous rotation?

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

    In a motor, the torque that causes rotation is generated by the interaction between which two fields?

    <p>The magnetic field of the stator and the magnetic field of the rotor</p> Signup and view all the answers

    Which law governs the magnitude and direction of the force experienced by a current-carrying conductor in a magnetic field, as observed in the operation of a motor?

    <p>Fleming's left-hand rule</p> Signup and view all the answers

    In a generator, what is the primary function of the coil or armature?

    <p>To rotate within the magnetic field, inducing an emf</p> Signup and view all the answers

    What is the primary factor that determines whether a generator produces alternating current (AC) or direct current (DC)?

    <p>The presence or absence of a commutator</p> Signup and view all the answers

    In an AC generator, what is the primary role of the brushes?

    <p>To conduct current between the rotating coil and stationary wires</p> Signup and view all the answers

    What is the underlying principle that allows a motor to convert electrical energy into mechanical energy?

    <p>The motor effect</p> Signup and view all the answers

    In a generator, which component is responsible for conducting current between the rotating coil and the external circuit?

    <p>Slip rings</p> Signup and view all the answers

    In a DC generator, what is the primary purpose of the commutator?

    <p>To reverse the direction of the induced current every half-turn, producing a direct current</p> Signup and view all the answers

    Which of the following best describes the operation of an AC generator?

    <p>The rotation of the coil induces a changing magnetic flux, generating an alternating EMF and current, which is allowed to flow out continuously through slip rings</p> Signup and view all the answers

    What principle governs the direction of the force experienced by a current-carrying conductor placed within a magnetic field?

    <p>Fleming's left-hand rule</p> Signup and view all the answers

    In a motor, what is the primary role of the commutator (for DC motors) or the alternating current power supply (for AC motors)?

    <p>To ensure continuous rotation by reversing the current or changing the magnetic field, respectively</p> Signup and view all the answers

    Which component in a generator is responsible for conducting current between the stationary wires and the rotating parts?

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

    What is the primary function of the magnetic field in a generator?

    <p>To induce a changing magnetic flux within the coil</p> Signup and view all the answers

    Which law governs the generation of an electromotive force (EMF) in a generator?

    <p>Faraday's law of electromagnetic induction</p> Signup and view all the answers

    In a motor, what is the primary role of the magnetic field established around the coil?

    <p>To provide a force on the current-carrying coil, causing rotation</p> Signup and view all the answers

    What is the key difference between the energy conversion process in a generator and a motor?

    <p>Generators convert mechanical energy into electrical energy, while motors convert electrical energy into mechanical energy</p> Signup and view all the answers

    Which component in a DC motor ensures that the current flows in the correct direction to maintain continuous rotation?

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

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