In an ideal transformer, the most important function of the soft iron core is:
Correct answer: B. To improve the flux linkage between the primary and secondary coils
- A. To reduce eddy currents
- B. To improve the flux linkage between the primary and secondary coils
- C. To dissipate the heat generated by the two coils
- D. To eliminate the back e.m.f produced in the secondary coils
Explanation
The primary coil and the secondary coil are wound on the soft iron core. The soft iron core has high permeability and it provides a complete linkage of the magnetic flux of the primary coil with the secondary coil. The hysteresis loss of soft iron is very less.
This question appeared on the HEC Phase II 2017 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Transformers questions
Which one of the following materials is more suitable for making cores of transformers?
If constant current passes through the primary coil of a transformer, then the induced electromotive force (e.m.f.) across the secondary coil of the transformer will
A transformer is used to change theI. resistanceII. capacitanceIII. currentIV. voltage
The device which increases or decreases the emf is called:
Transformer works on the principle of
A transformer steps down from 200V to 50V. If it has a secondary winding of 40 turns, then the number of windings in the primary coil are: