Electromagnetic Induction and Faraday's Law
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Questions and Answers

What is the principle behind the operation of DC generators?

  • Faraday's law of electromagnetic induction (correct)
  • Ohm's law
  • Newton's law of motion
  • Kirchhoff's law

    • What is the hysteresis loop area a measure of?

  • Current flowing through a material
  • Energy loss in a ferromagnetic material (correct)
  • Voltage across a material
  • Magnetic field strength

    • What happens when a conductor is placed in a varying magnetic field?

  • The magnetic field is cancelled
  • An electric current is generated
  • The conductor is magnetized
  • An electromotive force gets induced (correct)

    • If a charge of 4 coulombs is passed in 1 second, what is the current?

    <p>4 Ampere</p> Signup and view all the answers

    If 3 joules of work is done to charge a body to 1 coulomb, what is the voltage?

    <p>3 Volt</p> Signup and view all the answers

    What is the condition for inducing an emf in a conductor according to Faraday's law of induction?

    <p>When it cuts the magnetic flux</p> Signup and view all the answers

    What is the SI unit of magnetic flux?

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

    What does EMF stand for?

    <p>Electromotive force</p> Signup and view all the answers

    What is proportional to the magnitude of the induced emf in a circuit?

    <p>Rate of change of magnetic flux</p> Signup and view all the answers

    If a current of 7 amperes flows for 1 second, what is the charge?

    <p>7 coulombs</p> Signup and view all the answers

    What is the mathematical expression for the magnitude of induced emf?

    <p>ε = -dϕ/dt</p> Signup and view all the answers

    What is the unit of frequency?

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

    What is the unit of electromotive force that measures the potential difference in electric potential between two points?

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

    What is the relationship between the magnetic field strength and the magnetic flux density of a material represented by?

    <p>B-H curve</p> Signup and view all the answers

    What does the negative sign in Faraday's second law of electromagnetic induction indicate?

    <p>The direction of the induced emf</p> Signup and view all the answers

    What is the frequency of an alternating current?

    <p>The number of waves passing through a point in one second</p> Signup and view all the answers

    What is the unit of magnetic flux density?

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

    What is the magnetic flux density represented by in the B-H curve?

    <p>Magnetic flux density</p> Signup and view all the answers

    What is the formula to find the equivalent resistance between two nodes in a delta-connected circuit?

    <p>Rc+Rb+Rc*Rb/Ra</p> Signup and view all the answers

    What is the equivalent resistance between node 1 and node 3 in the star connected circuit?

    <p>29ohm</p> Signup and view all the answers

    What is the relation between line voltage and phase voltage in a delta-connected load?

    <p>Line voltage is equal to phase voltage</p> Signup and view all the answers

    What generates a polyphase system?

    <p>Having two or more generator windings separated by equal electrical angle</p> Signup and view all the answers

    What is the condition for a polyphase system to be generated?

    <p>The generator windings are separated by equal electrical angle</p> Signup and view all the answers

    What determines the electrical angle or displacement in a polyphase system?

    <p>The number of windings or phases</p> Signup and view all the answers

    What is the advantage of a three-phase AC system over a single-phase AC system?

    <p>All of the above</p> Signup and view all the answers

    Why does a three-phase system need less conductor material than a single-phase system?

    <p>To transmit a specific power over a specific distance at a given rated voltage</p> Signup and view all the answers

    What is the benefit of a three-phase supply system in terms of voltage drop?

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

    What is the characteristic of the magnetic field produced by a three-phase power supply system?

    <p>Uniform rotating magnetic field</p> Signup and view all the answers

    What is the correct sequence of three-phase voltages reaching their maximum positive values?

    <p>A-B-C</p> Signup and view all the answers

    What is the type of three-phase connection described in the text?

    <p>Three-Phase Three-Wire Star Connected System</p> Signup and view all the answers

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