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Questions and Answers
Inside a magnet, the magnetic field lines move from:
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?
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?
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?
What principle does a DC generator operate on?
According to Oersted, how are electricity and magnetism related?
According to Oersted, how are electricity and magnetism related?
Which rule helps remember the direction of magnetic field, current, and magnetic thrust force when a conducting rod is introduced to a magnetic field?
Which rule helps remember the direction of magnetic field, current, and magnetic thrust force when a conducting rod is introduced to a magnetic field?
What is the SI unit of magnetic flux?
What is the SI unit of magnetic flux?
Which physicist is the unit of magnetic flux named after?
Which physicist is the unit of magnetic flux named after?
What does EMF stand for in the context of electromotive force?
What does EMF stand for in the context of electromotive force?
How is one Volt defined?
How is one Volt defined?
In the B-H curve, what does 'H' represent?
In the B-H curve, what does 'H' represent?
What does the B-H curve graphically represent?
What does the B-H curve graphically represent?
What is the equivalent resistance between nodes A and B in the star connected circuit?
What is the equivalent resistance between nodes A and B in the star connected circuit?
In a delta-connected load, what is the relation between line voltage and phase voltage?
In a delta-connected load, what is the relation between line voltage and phase voltage?
When transforming from a star to delta connection, what should be added to find the equivalent resistance?
When transforming from a star to delta connection, what should be added to find the equivalent resistance?
What does a polyphase system require for generation?
What does a polyphase system require for generation?
In a delta connection, what is the equivalent resistance between nodes B and C?
In a delta connection, what is the equivalent resistance between nodes B and C?
What is the relationship between line voltage and phase voltage in a delta-connected load?
What is the relationship between line voltage and phase voltage in a delta-connected load?
What is the material commonly used in electromagnets and magnetic circuits due to its high magnetic permeability?
What is the material commonly used in electromagnets and magnetic circuits due to its high magnetic permeability?
Which law suggests that the direction of induced EMF opposes the change in magnetic flux?
Which law suggests that the direction of induced EMF opposes the change in magnetic flux?
What corresponds to MMF in a magnetic circuit in an electric circuit?
What corresponds to MMF in a magnetic circuit in an electric circuit?
From which material would the B-H curve not be a straight line due to high saturation magnetization?
From which material would the B-H curve not be a straight line due to high saturation magnetization?
Which material has the least area of Hysteresis loop among the options?
Which material has the least area of Hysteresis loop among the options?
How can the direction of induced EMF be accurately determined according to electromagnetic laws?
How can the direction of induced EMF be accurately determined according to electromagnetic laws?
In a polyphase electrical system, what does having two or more generator windings separated by equal electrical angle result in?
In a polyphase electrical system, what does having two or more generator windings separated by equal electrical angle result in?
What is the electrical angle between each phase in a three-phase electrical system?
What is the electrical angle between each phase in a three-phase electrical system?
What is the sum of all three generated voltages in a three-phase AC circuit?
What is the sum of all three generated voltages in a three-phase AC circuit?
In a star connected three-phase AC circuit, how does the phase voltage compare to the line voltage?
In a star connected three-phase AC circuit, how does the phase voltage compare to the line voltage?
What determines the electromotive force generated in each coil in a three-phase AC circuit?
What determines the electromotive force generated in each coil in a three-phase AC circuit?
Why are the windings in a three-phase alternator displaced by 120 degrees from each other?
Why are the windings in a three-phase alternator displaced by 120 degrees from each other?
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