Oersted's Phenomenon and Magnetic Field Direction Quiz
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Questions and Answers

Inside a magnet, the magnetic field lines move from:

  • Toward the north pole
  • South to north (correct)
  • Away from the south pole
  • North to south

    • What determines the direction of rotation of a coil in an electric motor?

  • Fleming's right hand rule (correct)
  • Faraday's law of electromagnetic induction
  • Ohm's law
  • None of the above

    • How can current be induced in a coil?

  • By applying heat to the coil
  • By changing the color of the coil
  • By increasing the coil's resistance
  • By moving the coil in a magnetic field (correct)

    • What principle does a DC generator operate on?

    <p>Newton's third law of motion</p> Signup and view all the answers

    According to Oersted, how are electricity and magnetism related?

    <p>Magnetism causes electricity</p> Signup and view all the answers

    Which rule helps remember the direction of magnetic field, current, and magnetic thrust force when a conducting rod is introduced to a magnetic field?

    <p>Newton's second law of motion</p> Signup and view all the answers

    What is the SI unit of magnetic flux?

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

    Which physicist is the unit of magnetic flux named after?

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

    What does EMF stand for in the context of electromotive force?

    <p>Electromagnetic Flux</p> Signup and view all the answers

    How is one Volt defined?

    <p>Joule/Coulomb</p> Signup and view all the answers

    In the B-H curve, what does 'H' represent?

    <p>Magnetizing Force</p> Signup and view all the answers

    What does the B-H curve graphically represent?

    <p>Magnetic Field Strength vs. Magnetic Flux Density</p> Signup and view all the answers

    What is the equivalent resistance between nodes A and B in the star connected circuit?

    <p>32 ohm</p> Signup and view all the answers

    In a delta-connected load, what is the relation between line voltage and phase voltage?

    <p>Line voltage = phase voltage</p> Signup and view all the answers

    When transforming from a star to delta connection, what should be added to find the equivalent resistance?

    <p>Sum of the resistances</p> Signup and view all the answers

    What does a polyphase system require for generation?

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

    In a delta connection, what is the equivalent resistance between nodes B and C?

    <p>$R_c + R_b + R_c * R_b / R_a$</p> Signup and view all the answers

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

    <p>$Line voltage = Phase voltage$</p> Signup and view all the answers

    What is the material commonly used in electromagnets and magnetic circuits due to its high magnetic permeability?

    <p>Soft Iron</p> Signup and view all the answers

    Which law suggests that the direction of induced EMF opposes the change in magnetic flux?

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

    What corresponds to MMF in a magnetic circuit in an electric circuit?

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

    From which material would the B-H curve not be a straight line due to high saturation magnetization?

    <p>Soft Iron</p> Signup and view all the answers

    Which material has the least area of Hysteresis loop among the options?

    <p>Soft Iron</p> Signup and view all the answers

    How can the direction of induced EMF be accurately determined according to electromagnetic laws?

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

    In a polyphase electrical system, what does having two or more generator windings separated by equal electrical angle result in?

    <p>Generation of polyphase electrical system</p> Signup and view all the answers

    What is the electrical angle between each phase in a three-phase electrical system?

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

    What is the sum of all three generated voltages in a three-phase AC circuit?

    <p>Zero (0)</p> Signup and view all the answers

    In a star connected three-phase AC circuit, how does the phase voltage compare to the line voltage?

    <p>Phase voltage is square root three times line voltage and phase current is equal to line current</p> Signup and view all the answers

    What determines the electromotive force generated in each coil in a three-phase AC circuit?

    <p>Magnitude and direction of the coils</p> Signup and view all the answers

    Why are the windings in a three-phase alternator displaced by 120 degrees from each other?

    <p>To create a balanced and efficient power generation system</p> Signup and view all the answers

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