Answer / sagar hingmire

Dielctric medium means a medium which is partially a
conductor & partially a insulator.
Take example of Air as dielectric medium,up to 30 kV air is
a good insulator but beyond 30 kV air acts as a
conductor.That means dielectric value or Breakdown voltage
(BDV) of air is 30 kV.
For water as we know water is very good conductor of
electricity,Heat so water is not a dielectric but it is a
conductor.

Answer / sidharth

Dielectrics are insulators. Only when the applied field across the medium is very high i.e. greater than the breakdown voltage of the dielectric, the dielectric breaks down, thus losing its prime property. SO, i think it cannot be called a 'partial conductor' since it is forced to conduct, not naturally.
Dielectric strength of dry air is 30kV/cm
" " " moist air is 10kV/cm
Water is a pure conductor.

Why in India only 50hz frequency not 60hz

2 Answers   Prism Cement,

---

how to calculate the cable size for 500 kva transformer?

3 Answers  

---

how is the cable tray designed & how its total length is calculated for an Industrial plant Say for Ex. (500KW Motor Load)

0 Answers  

---

What is maximum demand and contract demand?

5 Answers  

---

what is diffrent of RCCB & MCCB

6 Answers  

---

why neutral is neccessary?

7 Answers  

---

What is meant by reset level of the relay?

0 Answers  

---

i need previous entrence exam papers of nhpc.

0 Answers  

---

What is the name of process In VFD frequency are increase then voltage increase & frequency decrease then voltage decrease?

0 Answers  

---

explain me how a power factor is improved by adding a capacitor?what capacitor do to improve it?in simple words and in detail?thx

7 Answers  

---

What is minimum permicible value of leackage current for LT Panle when applying voltage up to 3 KV for 5 Minuits?

0 Answers   BFL,

---

The corona effect is more in a) summer b) winter c) dry weather d) humidity weather

10 Answers   CPCL,

---