Question

The core of a transformer is laminated because :-

• A. ratio of voltage in primary and secondary may be increased
• B. energy losses due to eddy currents may be minimised
• C. the weight of the transformer may be reduced
• D. rusting of the core may be prevented.

Answer 1

The Correct Option is B

The question asks why the core of a transformer is laminated. Let's evaluate the options one by one:

• Option 1: Ratio of voltage in primary and secondary may be increased
  This option is incorrect. The voltage ratio in a transformer depends on the turns ratio of the primary and secondary coils, not on whether the core is laminated.
• Option 2: Energy losses due to eddy currents may be minimized
  This is the correct answer. Laminating the core of a transformer helps to minimize energy losses due to eddy currents. When alternating current flows through the transformer, it induces eddy currents in the iron core. Laminating the core increases its resistance and restricts the flow of eddy currents, thereby minimizing energy losses.
• Option 3: The weight of the transformer may be reduced
  This option is incorrect. Laminating the core does not significantly reduce the weight of the transformer.
• Option 4: Rusting of the core may be prevented
  This option is incorrect. Laminating the core does not necessarily prevent rusting. Other protective coating methods are used for that purpose.

Thus, the core of a transformer is laminated to minimize energy losses due to eddy currents. This concept is crucial in improving the efficiency of transformers.