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Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, then
  • a)
    the magnitude of current and power factor both will increase
  • b)
    the magnitude of current will decrease but the power factor will increase
  • c)
    the magnitude of current will increase but the power factor will decrease
  • d)
    the magnitude of current as well as the power factor will decrease
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Short-circuit test is performed on a transformer with a certain impres...
Short-Circuit Test on Transformer at Rated Frequency and Impressed Voltage

Short-circuit test is a type of transformer testing that is done to determine the equivalent circuit parameters of a transformer. In this test, the secondary winding of the transformer is short-circuited, and a certain magnitude of impressed voltage is applied to the primary winding at the rated frequency.

Short-Circuit Test on Transformer at Higher Frequency and Same Impressed Voltage

If the short-circuit test is performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, then the following changes will occur:

Magnitude of Current and Power Factor

The magnitude of current as well as the power factor will decrease. This is because at a higher frequency, the reactance of the transformer windings will increase, which will reduce the current flow. Moreover, the power factor will also decrease because the resistance of the transformer windings will remain constant, but the reactance will increase.

Explanation of the Correct Answer

Option 'D' is the correct answer, which states that the magnitude of current as well as the power factor will decrease. This is because, at a higher frequency, the impedance of the transformer windings will increase, which will reduce the current flow. Moreover, the power factor will also decrease because the resistance of the transformer windings will remain constant, but the reactance will increase.
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Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, thena)the magnitude of current and power factor both will increaseb)the magnitude of current will decrease but the power factor will increasec)the magnitude of current will increase but the power factor will decreased)the magnitude of current as well as the power factor will decreaseCorrect answer is option 'D'. Can you explain this answer?
Question Description
Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, thena)the magnitude of current and power factor both will increaseb)the magnitude of current will decrease but the power factor will increasec)the magnitude of current will increase but the power factor will decreased)the magnitude of current as well as the power factor will decreaseCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, thena)the magnitude of current and power factor both will increaseb)the magnitude of current will decrease but the power factor will increasec)the magnitude of current will increase but the power factor will decreased)the magnitude of current as well as the power factor will decreaseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, thena)the magnitude of current and power factor both will increaseb)the magnitude of current will decrease but the power factor will increasec)the magnitude of current will increase but the power factor will decreased)the magnitude of current as well as the power factor will decreaseCorrect answer is option 'D'. Can you explain this answer?.
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