Question

The hysteresis curve for the transformer cores should be:
1. Tall and wide
2. Tall and narrow
3. Short and wide
4. Short and narrow

Answer 1

Correct Answer - Option 2 : Tall and narrow

CONCEPT:

Electromagnet:

• An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
• Electromagnets usually consist of wire wounds into a coil.
• The magnetism of the electromagnets can be increased by placing a soft iron rod inside the solenoid.
• The core of electromagnets is made of ferromagnetic materials which have high permeability and low retentivity.
• Electromagnets are used in electric bells, loudspeakers, and telephone diaphragms.
• Giant electromagnets are used in cranes to lift machinery, and bulk quantities of iron and steel.
• In certain applications like transformer cores and telephone diaphragms, the material goes through an ac cycle of magnetization for a long period.
• The hysteresis curve for the core of the transformer and telephone diaphragms should be tall and narrow. So that the energy dissipated and the heating will consequently be small.

EXPLANATION:

• The hysteresis curve for the core of the transformer and telephone diaphragms should be tall and narrow. So that the energy dissipated and the heating will consequently be small. Hence, option 2 is correct.