Answer / monika hassan

When the magnetic field through the core changes, the magnetization of the core material changes by expansion and contraction of the tiny magnetic domains it is composed of, due to movement of the domain walls. This is a lossy process, because the domain walls get "snagged" on defects in the crystal structure and then "snap" past them, dissipating energy as heat. This is called hysteresis loss. It can be seen in the graph of the B field versus the H field for the material, which has the form of a closed loop. The amount of energy lost in the material in one cycle of the applied field is proportional to the area inside the hysteresis loop. Hysteresis loss increases with higher frequencies as more cycles are undergone per unit time.

why autotransformers are not safe for supplying low voltage from a high voltage source?

5 Answers  

---

what is distribution board?

0 Answers  

---

why the power cut problems occur in tamil nadu? may i know the exact reason.plz

17 Answers  

---

What is thresh hold value of current?

0 Answers  

---

what is mean by dry frequency

0 Answers   Siemens, TCS,

---

how can we detect that which is receiving side and which is sendind end of a trnasmmison line by just seiing it?i.e its which end is coming from genertaing and distribution side?

5 Answers  

---

How big (size) can the tertiary winding be in transformer? Can we load the tertiary winding, if yes then how much we can load it?

1 Answers  

---

Why we use d.c. meger in a.c. induction motor?

1 Answers  

---

How many VSC based HVDC are there in India and the world

0 Answers  

---

How can we step up ac and dc ?

1 Answers  

---

how to calculate power

3 Answers  

---

Explain the propagation of harmonics in the network and influence of phase angle of harmonics.

0 Answers  

---