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Questions and Answers
In a generator, the __________ is the support on which the stator windings are mounted.
In a generator, the __________ is the support on which the stator windings are mounted.
frame
A generator converts _________ energy into electrical energy.
A generator converts _________ energy into electrical energy.
mechanical
When electromagnetic current runs back on itself it is called ________.
When electromagnetic current runs back on itself it is called ________.
eddying
Some generators use brushes and slip rings on the rotor to pass direct current to the __________ windings.
Some generators use brushes and slip rings on the rotor to pass direct current to the __________ windings.
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An AC generator is composed of __________ basic parts.
An AC generator is composed of __________ basic parts.
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Generators that do not use brushes or slip rings are equipped with brushless __________.
Generators that do not use brushes or slip rings are equipped with brushless __________.
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Direct current flowing through the field windings forms __________.
Direct current flowing through the field windings forms __________.
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The radial clearance between the rotor and the stator is called the __________.
The radial clearance between the rotor and the stator is called the __________.
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In order for voltage to be generated in the stator windings, __________ must exist between the field and the conductor of the stator.
In order for voltage to be generated in the stator windings, __________ must exist between the field and the conductor of the stator.
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Generators that produce three separate currents of electricity at the same time are called __________ generators.
Generators that produce three separate currents of electricity at the same time are called __________ generators.
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Which of the following is made of laminated steel and is mounted inside the frame?
Which of the following is made of laminated steel and is mounted inside the frame?
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While a generator is connected to a power system, the rotor field and the stator field are basically __________.
While a generator is connected to a power system, the rotor field and the stator field are basically __________.
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In Michael Faraday's experiment, as the magnet was withdrawn, a current flowed through the coil __________.
In Michael Faraday's experiment, as the magnet was withdrawn, a current flowed through the coil __________.
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A two pole generator will have a synchronous speed of __________ rpm.
A two pole generator will have a synchronous speed of __________ rpm.
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Which of the following characteristics of the rotating field determines the frequency of the voltage induced in the stator?
Which of the following characteristics of the rotating field determines the frequency of the voltage induced in the stator?
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To produce voltage, the magnetic field must be close to the __________.
To produce voltage, the magnetic field must be close to the __________.
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When the conductor or magnetic field moves, _________ within the conductor are forced to move from one direction to the other.
When the conductor or magnetic field moves, _________ within the conductor are forced to move from one direction to the other.
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Relative motion must occur between the magnetic field and the conductor to produce _________.
Relative motion must occur between the magnetic field and the conductor to produce _________.
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A four pole generator will have a synchronous speed of __________ rpm.
A four pole generator will have a synchronous speed of __________ rpm.
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When a generator is connected to the power system, the __________ must be increased to produce an increase in power output from the generator.
When a generator is connected to the power system, the __________ must be increased to produce an increase in power output from the generator.
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Increasing the main field above a value needed to maintain unit power factor will cause the voltage to lead the current and the generator to act like a __________.
Increasing the main field above a value needed to maintain unit power factor will cause the voltage to lead the current and the generator to act like a __________.
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Inductive current.
Inductive current.
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Capacitive current.
Capacitive current.
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Most instruments used to measure AC values read in __________.
Most instruments used to measure AC values read in __________.
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What is the number used to calculate the peak-to-peak value of a sine wave when the RMS value is known?
What is the number used to calculate the peak-to-peak value of a sine wave when the RMS value is known?
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Study Notes
Generator Components
- The frame is the support structure for stator windings in a generator.
- A generator converts mechanical energy into electrical energy.
- Some generators utilize brushes and slip rings to transfer direct current to field windings.
- The core of a generator is made of laminated steel and is mounted inside the frame.
Generator Operation
- In operation, the rotor field and stator field are interlocked when connected to a power system.
- A two-pole generator exhibits a synchronous speed of 3600 rpm.
- A four-pole generator shows a synchronous speed of 1800 rpm.
- Relative motion is crucial between the magnetic field and conductor for voltage generation.
Electromagnetic Concepts
- Eddy currents occur when electromagnetic currents loop back on themselves.
- Direct current through the field windings results in an electromagnet.
- When magnetic fields or conductors move, electrons are forced to shift directions.
Generator Types and Systems
- AC generators consist of two primary parts: rotor and stator.
- Brushless excitation systems replace brushes and slip rings in certain generator models.
- Three-phase generators produce three distinct currents of electricity simultaneously.
- Instruments for measuring AC values typically read in RMS (Root Mean Square).
Electrical Relations and Effects
- Increasing the main field can lead the voltage past the current, causing the generator to behave like a capacitor.
- Inductive current lags, while capacitive current leads in terms of phase relation.
- The relationship between capacitive and inductive behaviors affects energy delivery and efficiency.
Measurement and Calculations
- The peak-to-peak value of a sine wave can be determined using the square root of 2 (1.414) from the RMS value.
- The necessary electrical circumstances for stator windings include the existence of relative motion and charges.
Additional Important Concepts
- The air gap is the radial clearance between the rotor and stator, important for efficient operation.
- Prime mover power must be increased to enhance power output from the generator during operation.
- The speed of the rotating field determines the frequency of voltage induced in the stator windings.
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Description
Test your knowledge on fundamental concepts of generators with this quiz. Questions cover the components and energy conversion processes of generators. Perfect for electrical engineering students and enthusiasts alike.
