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The four methods of calculating voltage regulation of a 3-phase alternator are:
- Emf method
- Saturated synchronous reactance method
- New ASA method
- Mmf method
The correct sequence in the ascending order of the values of regulation obtained by these methods is
- a)4, 3, 1,2
- b)4, 3, 2, 1
- c)3, 4, 2,1
- d)3, 4, 1,2
Correct answer is option 'B'. Can you explain this answer?
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The four methods of calculating voltage regulation of a 3-phase altern...
Explanation:
The four methods of calculating voltage regulation of a 3-phase alternator are:
1. Emf method
2. Saturated synchronous reactance method
3. New ASA method
4. Mmf method
To determine the correct sequence in the ascending order of the values of regulation obtained by these methods, let's understand each method briefly.
1. Emf method:
In the Emf method, the synchronous reactance (Xd) and armature resistance (Ra) of the alternator are known. The voltage regulation is calculated using the formula:
\[ \% \, \text{Voltage Regulation} = \frac{(V_{NL} - V_{FL})}{V_{FL}} \times 100 \]
where \(V_{NL}\) is the no-load terminal voltage and \(V_{FL}\) is the full-load terminal voltage.
2. Saturated synchronous reactance method:
In the saturated synchronous reactance method, the synchronous reactance is calculated by subtracting the armature reaction reactance from the unsaturated synchronous reactance. The voltage regulation is then calculated using the formula mentioned in the Emf method.
3. New ASA method:
The New ASA (American Standards Association) method is a modified version of the Emf method. In this method, the synchronous reactance is determined by conducting open-circuit and short-circuit tests on the alternator. The voltage regulation is calculated using the same formula as in the Emf method.
4. Mmf method:
The Mmf (Magnetomotive Force) method is based on the concept of magnetizing current. The voltage regulation is calculated using the formula:
\[ \% \, \text{Voltage Regulation} = \frac{(V_{NL} - V_{FL})}{V_{FL}} \times \frac{I_{FL}}{I_{NL}} \times 100 \]
where \(I_{FL}\) is the full-load current and \(I_{NL}\) is the no-load current.
Ascending order of values of regulation:
To determine the correct sequence in the ascending order of the values of regulation obtained by these methods, we compare the methods based on the complexity and accuracy of their calculations.
Based on these factors, the correct sequence in the ascending order of the values of regulation obtained by these methods is:
4, 3, 2, 1
The four methods of calculating voltage regulation of a 3-phase alternator are:
1. Emf method
2. Saturated synchronous reactance method
3. New ASA method
4. Mmf method
To determine the correct sequence in the ascending order of the values of regulation obtained by these methods, let's understand each method briefly.
1. Emf method:
In the Emf method, the synchronous reactance (Xd) and armature resistance (Ra) of the alternator are known. The voltage regulation is calculated using the formula:
\[ \% \, \text{Voltage Regulation} = \frac{(V_{NL} - V_{FL})}{V_{FL}} \times 100 \]
where \(V_{NL}\) is the no-load terminal voltage and \(V_{FL}\) is the full-load terminal voltage.
2. Saturated synchronous reactance method:
In the saturated synchronous reactance method, the synchronous reactance is calculated by subtracting the armature reaction reactance from the unsaturated synchronous reactance. The voltage regulation is then calculated using the formula mentioned in the Emf method.
3. New ASA method:
The New ASA (American Standards Association) method is a modified version of the Emf method. In this method, the synchronous reactance is determined by conducting open-circuit and short-circuit tests on the alternator. The voltage regulation is calculated using the same formula as in the Emf method.
4. Mmf method:
The Mmf (Magnetomotive Force) method is based on the concept of magnetizing current. The voltage regulation is calculated using the formula:
\[ \% \, \text{Voltage Regulation} = \frac{(V_{NL} - V_{FL})}{V_{FL}} \times \frac{I_{FL}}{I_{NL}} \times 100 \]
where \(I_{FL}\) is the full-load current and \(I_{NL}\) is the no-load current.
Ascending order of values of regulation:
To determine the correct sequence in the ascending order of the values of regulation obtained by these methods, we compare the methods based on the complexity and accuracy of their calculations.
Based on these factors, the correct sequence in the ascending order of the values of regulation obtained by these methods is:
4, 3, 2, 1
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Community Answer
The four methods of calculating voltage regulation of a 3-phase altern...
The methods listed can be used to calculate the voltage regulation of a 3-phase alternator, and the ascending order of the values obtained is as follows:
- MMF method: The MMF (Magnetomotive Force) method typically provides the highest voltage regulation values among the listed methods. Therefore, it is the highest value.
- New ASA method: The New ASA (Alternating Synchro Angle) method provides slightly lower voltage regulation values compared to the MMF method but higher than the remaining methods.
- Saturated synchronous reactance method: The saturated synchronous reactance method gives lower voltage regulation values compared to the New ASA method.
- EMF (Electromotive Force) method: The EMF method typically provides the lowest voltage regulation values among the listed methods.
Therefore, the correct answer is: B: 4, 3, 2, 1.
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The four methods of calculating voltage regulation of a 3-phase alternator are: Emf method Saturated synchronous reactance method New ASA method Mmf methodThe correct sequence in the ascending order of the values of regulation obtained by these methods isa)4, 3, 1,2b)4, 3, 2, 1c)3, 4, 2,1d)3, 4, 1,2Correct answer is option 'B'. Can you explain this answer?
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