Question

If the area of the hysteresis curve of the transformer cores is large, then it will dissipate:
1. Low heat
2. High heat
3. Depends on the orientation
4. Can't say

Answer 1

Correct Answer - Option 2 : High heat

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.
• Therefore if the area of the hysteresis curve of the transformer cores is large, then it will dissipate high heat. Hence, option 2 is correct.