Podcast
Questions and Answers
What is the principle behind the operation of DC generators?
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?
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?
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?
If a charge of 4 coulombs is passed in 1 second, what is the current?
If 3 joules of work is done to charge a body to 1 coulomb, what is the voltage?
If 3 joules of work is done to charge a body to 1 coulomb, what is the voltage?
What is the condition for inducing an emf in a conductor according to Faraday's law of induction?
What is the condition for inducing an emf in a conductor according to Faraday's law of induction?
What is the SI unit of magnetic flux?
What is the SI unit of magnetic flux?
What does EMF stand for?
What does EMF stand for?
What is proportional to the magnitude of the induced emf in a circuit?
What is proportional to the magnitude of the induced emf in a circuit?
If a current of 7 amperes flows for 1 second, what is the charge?
If a current of 7 amperes flows for 1 second, what is the charge?
What is the mathematical expression for the magnitude of induced emf?
What is the mathematical expression for the magnitude of induced emf?
What is the unit of frequency?
What is the unit of frequency?
What is the unit of electromotive force that measures the potential difference in electric potential between two points?
What is the unit of electromotive force that measures the potential difference in electric potential between two points?
What is the relationship between the magnetic field strength and the magnetic flux density of a material represented by?
What is the relationship between the magnetic field strength and the magnetic flux density of a material represented by?
What does the negative sign in Faraday's second law of electromagnetic induction indicate?
What does the negative sign in Faraday's second law of electromagnetic induction indicate?
What is the frequency of an alternating current?
What is the frequency of an alternating current?
What is the unit of magnetic flux density?
What is the unit of magnetic flux density?
What is the magnetic flux density represented by in the B-H curve?
What is the magnetic flux density represented by in the B-H curve?
What is the formula to find the equivalent resistance between two nodes in a delta-connected circuit?
What is the formula to find the equivalent resistance between two nodes in a delta-connected circuit?
What is the equivalent resistance between node 1 and node 3 in the star connected circuit?
What is the equivalent resistance between node 1 and node 3 in the star connected circuit?
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 in a delta-connected load?
What generates a polyphase system?
What generates a polyphase system?
What is the condition for a polyphase system to be generated?
What is the condition for a polyphase system to be generated?
What determines the electrical angle or displacement in a polyphase system?
What determines the electrical angle or displacement in a polyphase system?
What is the advantage of a three-phase AC system over a single-phase AC system?
What is the advantage of a three-phase AC system over a single-phase AC system?
Why does a three-phase system need less conductor material than a single-phase system?
Why does a three-phase system need less conductor material than a single-phase system?
What is the benefit of a three-phase supply system in terms of voltage drop?
What is the benefit of a three-phase supply system in terms of voltage drop?
What is the characteristic of the magnetic field produced by a three-phase power supply system?
What is the characteristic of the magnetic field produced by a three-phase power supply system?
What is the correct sequence of three-phase voltages reaching their maximum positive values?
What is the correct sequence of three-phase voltages reaching their maximum positive values?
What is the type of three-phase connection described in the text?
What is the type of three-phase connection described in the text?
