A. provide support to windings.
B. reduce hysteresis loss.
C. decrease the reluctance of the magnetic path.
D. reduce eddy current losses.
Answer: C
Explanation:
B. reduce hysteresis loss.
C. decrease the reluctance of the magnetic path.
D. reduce eddy current losses.
Answer: C
Explanation:
- The core of the transformer is made up of soft iron it has high coercivity and low retentivity.
- The primary coil and the secondary coil are wound on the soft iron core.
- The iron core decreases the reluctance of the magnetic path to flow magnetic flux.
- 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.
- In transformers, the two coils are wound onto the same iron core. The purpose of the iron core is to channel the magnetic flux generated by the current flowing around the primary coil so that as much of it as possible also links the secondary coil. The iron core is also used to decrease the magnitude of magnetizing current.
Additional Information
Transformer:
A Transformer is a static electrical machine that transfers AC electrical power from one circuit to the other circuit at a constant frequency, but the voltage level can be altered which means voltage can be increased or decreased according to the requirement.
Construction:
The transformer consists of
- Magnetic circuit (consisting of core, limbs, yoke, and damping structure)
- Electrical circuit (consisting of primary and secondary windings)
- Dielectric circuit (consisting of insulations in different forms and used at different places)
- Tanks and accessories (conservator, breather, bushings, cooling tubes, etc.)
Core:
- The purpose of the iron core is to channel the magnetic flux generated in the primary coil.
- The main problem with the transformer core is its hysteresis and eddy current losses.
- Hysteresis loss in the transformer mainly depends upon its core materials.
- A small quantity of Silicon alloyed with low carbon content steel produces material for the transformer core.
- It has low hysteresis loss and high permeability.
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