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Question

The quantity that remains unchanged in a transformer is


A

Voltage

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B

Current

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C

Frequency

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D

None of these

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Solution

The correct option is C

Frequency


The explanation for the correct option:

In the case of option C,

  1. A static device that aids in the conversion of electrical power from one circuit to another while keeping the frequency constant is known as a transformer
  2. It is used to increase or decrease the voltage but only in direct proportion to the current ratings.
  3. The frequency in a transformer is kept constant to avoid hysteresis and eddy current losses.
  4. Thus, frequencyatinput=frequencyatoutput.
  5. As supply frequency is constant so the output frequency will also be unchanged.

The explanation for the incorrect options:

In the case of option A,

  1. Using the mutual induction principle, a transformer transforms an alternating potential difference from one value to another of a larger or lower value.
  2. Therefore, although current and voltage in a transformer fluctuate, the frequency does not.

In the case of option B,

  1. A transformer uses the mutual induction principle to change an alternating potential difference from one value to another of higher or lesser value.
  2. In a transformer, current and voltage fluctuate but frequency does not.

In the case of option D,

  1. As we got the right answer option C that frequency remains unchanged in a transformer.
  2. so, this is not the case here.

Hence, option C is the correct answer.


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