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Which of the statements made here are incorrect 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, II, III
- b)IV
- c)I, III
- d)I, IV, III
Correct answer is option 'B'. Can you explain this answer?
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Which of the statements made here are incorrect regarding the transfor...
V.R. is always negative at leading p.f. and the load p.f. angle.
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Which of the statements made here are incorrect regarding the transfor...
Incorrect Statements Regarding the Transformer
There are four statements given regarding the transformer, and we need to identify which of them are incorrect. Let's analyze each statement one by one.
I. Maximum voltage regulation occurs at the leading p.f.
This statement is incorrect. Voltage regulation refers to the change in output voltage of a transformer when the load varies. The maximum voltage regulation occurs at the lagging power factor, not at the leading power factor. This is because at lagging power factor, the load current lags behind the voltage, resulting in a higher drop across the impedance of the transformer.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
This statement is incorrect. The voltage regulation of a transformer depends on the power factor angle difference between the load and the transformer impedance. The maximum voltage regulation occurs when the load power factor angle is equal to the angle between the impedance of the transformer and the voltage. In other words, the maximum voltage regulation occurs when the load power factor angle is equal to the angle of the impedance voltage drop in the transformer.
III. V.R. at zero p.f. is always zero.
This statement is incorrect. The voltage regulation at zero power factor is not always zero. Zero power factor means that the load is purely reactive, and in this case, the voltage regulation can be significant. The reactive power causes additional losses in the transformer, resulting in a voltage drop.
IV. V.R. of a transformer may be negative at the leading p.f.
This statement is correct. The voltage regulation of a transformer can be negative at the leading power factor. Negative voltage regulation means that the output voltage of the transformer increases as the load increases. This can occur when the load power factor angle is leading and the impedance angle of the transformer is lagging.
Conclusion
Based on the analysis above, the incorrect statements regarding the transformer are:
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 the same.
III. V.R. at zero p.f. is always zero.
Therefore, the correct answer is option 'B', i.e., IV.
There are four statements given regarding the transformer, and we need to identify which of them are incorrect. Let's analyze each statement one by one.
I. Maximum voltage regulation occurs at the leading p.f.
This statement is incorrect. Voltage regulation refers to the change in output voltage of a transformer when the load varies. The maximum voltage regulation occurs at the lagging power factor, not at the leading power factor. This is because at lagging power factor, the load current lags behind the voltage, resulting in a higher drop across the impedance of the transformer.
II. Maximum voltage regulation occurs when load p.f. angle and impedance angle of the leakage impedance are the same.
This statement is incorrect. The voltage regulation of a transformer depends on the power factor angle difference between the load and the transformer impedance. The maximum voltage regulation occurs when the load power factor angle is equal to the angle between the impedance of the transformer and the voltage. In other words, the maximum voltage regulation occurs when the load power factor angle is equal to the angle of the impedance voltage drop in the transformer.
III. V.R. at zero p.f. is always zero.
This statement is incorrect. The voltage regulation at zero power factor is not always zero. Zero power factor means that the load is purely reactive, and in this case, the voltage regulation can be significant. The reactive power causes additional losses in the transformer, resulting in a voltage drop.
IV. V.R. of a transformer may be negative at the leading p.f.
This statement is correct. The voltage regulation of a transformer can be negative at the leading power factor. Negative voltage regulation means that the output voltage of the transformer increases as the load increases. This can occur when the load power factor angle is leading and the impedance angle of the transformer is lagging.
Conclusion
Based on the analysis above, the incorrect statements regarding the transformer are:
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 the same.
III. V.R. at zero p.f. is always zero.
Therefore, the correct answer is option 'B', i.e., IV.
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