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Questions and Answers
What is the condition for two practical sources to be equal?
What is the internal resistance of a practical voltage source replaced by a current source?
What is the voltage source equivalent to a practical current source in parallel with an internal resistance RS?
What is the main application of star-delta transformation?
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What is the purpose of source transformation technique?
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Which theorem is used to simplify a complex network?
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What is the purpose of Norton's Theorem?
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What is the condition for maximum emf induction in a rotating coil?
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What is the primary function of a transformer?
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What is the principle on which a transformer works?
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What type of current is required for mutual induction between the two windings of a transformer?
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What is the characteristic of an ideal transformer?
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What is the consequence of a change in the magnetic flux linked with a circuit?
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What is the purpose of using a transformer in a power circuit?
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What is the type of winding that is connected to the AC supply in a transformer?
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What is the direction of the induced emf in a transformer?
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What is the characteristic of a dependent source in a circuit?
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What is the typical output of a voltage-controlled voltage source (VCVS)?
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Which of the following is an example of a voltage-controlled current source (VCCS)?
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What is the gain term in a dependent source?
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Which of the following is a characteristic of a current-controlled voltage source (CCVS)?
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What is the typical output of a current-controlled current source (CCCS)?
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Which of the following devices is an example of a voltage-controlled voltage source (VCVS)?
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What is the purpose of dependent sources in circuit analysis?
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Study Notes
Practical Voltage and Current Sources
- A practical voltage source can be replaced by a current source in parallel with an internal resistance RS, and vice versa.
- The internal resistance RS is the key to transforming between voltage and current sources.
Star-Delta Transformation
- Star connection and delta connection are two methods of connecting three basic elements that cannot be further simplified into series or parallel.
- These two ways of representation can have equivalent circuits in either form.
Generation of Sinusoidal AC Voltage
- A rotating coil in a uniform magnetic field induces an emf according to Faraday's Law.
- The flux linking the coil changes as it rotates, inducing an emf that varies sinusoidally.
Transformer
- A transformer is a device that transfers electric energy from one AC circuit to one or more circuits, either increasing or reducing the voltage.
- It is used to reduce voltage for low-voltage devices or raise voltage for long-distance transmission.
- The transformer works on Faraday's law of mutual induction, requiring an alternating flux for mutual induction between the primary and secondary windings.
Ideal and Practical Transformers
- An ideal transformer has no losses (core losses, copper losses, etc.), 100% efficiency, and zero leakage reactance.
- In an ideal transformer, the leakage flux is considered nil.
- Practical transformers have losses and non-ideal characteristics.
Dependent Sources
- Dependent or controlled sources have a value that depends on the voltage or current at another location in the circuit.
- Types of dependent sources:
- Voltage-controlled voltage source (VCVS): output is controlled by another voltage in the circuit (e.g., idealized amplifier).
- Current-controlled voltage source (CCVS): output is controlled by a current in the circuit.
- Voltage-controlled current source (VCCS): output is controlled by a voltage in the circuit.
- Current-controlled current source (CCCS): output is controlled by a current in the circuit.
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Description
This quiz covers the concept of practical voltage and current sources, their characteristics, and how to equate them. It involves the internal resistance of the sources and their behavior with load resistances.
