The core of a transformer is laminated in order to
Correct answer: C. reduce energy lost as heat through eddy currents in the core
- A. make it lighter
- B. increase the flux through it
- C. reduce energy lost as heat through eddy currents in the core
- D. insulate the two coils from each other
Explanation
Thin sheets separated by insulating varnish break up the circulating paths available to eddy currents, so much less energy is dissipated as heat in the core. Soft iron is used because it is easily magnetised and demagnetised, keeping hysteresis loss low as well. The coils are insulated separately by the enamel on the wire.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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
Electrical power is transmitted over long distances at very high voltage because
A transformer with 1000 primary turns and 100 secondary turns is supplied at 220 V. The secondary voltage is
A step down transformer has
An ideal transformer is one in which
A transformer cannot be used with a direct current supply because
In an ideal transformer, if the primary voltage is doubled and the turns ratio remains the same, what happens to the secondary current?