Question

The core of a transformer is laminated so that

• A. energy loss due to eddy currents may be
  reduced
• B. rusting of the core may be prevented
• C. change in flux may be increased
• D. ratio of voltage in the primary to that in the
  secondary may be increased

Answer 1

The correct option is A energy loss due to eddy currents may be

reduced
The core of a transformer is laminated so that energy loss due to eddy currents may be reduced.
This ensures that the parts of core are separated from each other and there is less area available for eddy currents
Rusting of core may be prevented by coating of anti-rust material.
Change in flux is only dependent on no. of turns, magnetic field and area of coil.
Ratio of voltage in the primary to that in the secondary may be increased by increasing number of coils in primary coil.