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Which of the statements made here are correct regarding the transformer?
I. Maximum voltage regulation occurs at the leading p.f.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are same.
III. V.R. at zero p.f. is always zero.
IV. V.R. of a transformer may be negative at leading p.f.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are same.
III. V.R. at zero p.f. is always zero.
IV. V.R. of a transformer may be negative at leading p.f.
- a)I, III
- b)II, IV
- c)1, III
- d)I, IV, III
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the statements made here are correct regarding the transforme...
V.R. is always negative at leading p.f. and the load p.f. angle and impedance angle of the leakage impedance should be same for maximum V.R.
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Which of the statements made here are correct regarding the transforme...
Explanation:
The statements made here are about the voltage regulation in a transformer. Let's analyze each statement to determine which ones are correct.
I. Maximum voltage regulation occurs at the leading p.f.
This statement is incorrect. The voltage regulation of a transformer is the change in secondary terminal voltage when the load changes from no-load to full-load. Maximum voltage regulation occurs at lagging power factor, not leading power factor. At leading power factor, the voltage regulation is relatively lower.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
This statement is correct. Voltage regulation depends on the angle between the load power factor and the impedance angle of the leakage impedance. Maximum voltage regulation occurs when these angles are the same. In other words, maximum voltage regulation occurs when the load power factor is equal to the power factor angle of the transformer's leakage impedance.
III. V.R. at zero p.f. is always zero.
This statement is incorrect. Voltage regulation at zero power factor is not always zero. The voltage regulation at zero power factor depends on the transformer's design and characteristics. It can be positive, negative, or zero, depending on the transformer's construction and parameters.
IV. V.R. of a transformer may be negative at leading p.f.
This statement is correct. Voltage regulation can be negative at leading power factor. Negative voltage regulation means that the secondary terminal voltage increases as the load increases. This can occur when a transformer is over-excited, and the voltage at the secondary terminals is higher than the rated value.
Conclusion:
Based on the analysis of each statement, the correct statements are:
- II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
- IV. V.R. of a transformer may be negative at leading p.f.
Therefore, the correct answer is option 'B' (II, IV).
The statements made here are about the voltage regulation in a transformer. Let's analyze each statement to determine which ones are correct.
I. Maximum voltage regulation occurs at the leading p.f.
This statement is incorrect. The voltage regulation of a transformer is the change in secondary terminal voltage when the load changes from no-load to full-load. Maximum voltage regulation occurs at lagging power factor, not leading power factor. At leading power factor, the voltage regulation is relatively lower.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
This statement is correct. Voltage regulation depends on the angle between the load power factor and the impedance angle of the leakage impedance. Maximum voltage regulation occurs when these angles are the same. In other words, maximum voltage regulation occurs when the load power factor is equal to the power factor angle of the transformer's leakage impedance.
III. V.R. at zero p.f. is always zero.
This statement is incorrect. Voltage regulation at zero power factor is not always zero. The voltage regulation at zero power factor depends on the transformer's design and characteristics. It can be positive, negative, or zero, depending on the transformer's construction and parameters.
IV. V.R. of a transformer may be negative at leading p.f.
This statement is correct. Voltage regulation can be negative at leading power factor. Negative voltage regulation means that the secondary terminal voltage increases as the load increases. This can occur when a transformer is over-excited, and the voltage at the secondary terminals is higher than the rated value.
Conclusion:
Based on the analysis of each statement, the correct statements are:
- II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
- IV. V.R. of a transformer may be negative at leading p.f.
Therefore, the correct answer is option 'B' (II, IV).
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Which of the statements made here are correct regarding the transformer?I. Maximum voltage regulation occurs at the leading p.f.II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are same.III. V.R. at zero p.f. is always zero.IV. V.R. of a transformer may be negative at leading p.f.a)I, IIIb)II, IVc)1, IIId)I, IV, IIICorrect answer is option 'B'. Can you explain this answer?
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