Answer / rakesh

When an alternating potential difference is applied across
two conductors such that the spacing between the two is
large as comnpared to the spacing between the two , then an
electrostatic stress is set up , which gradually builds up
to make and makes the air around the conductor conducting ,
if he potential difference is increased to the extent that
exceeds the visual critical limit then comlete breakdown of
air takes place , and is accompanied by faint luminous glow
of violet colour , production of ozone gas , and hissing
noise .
DISADVANTAGES : 1. There is a definite los of power .
2. The corona current is non sinusoidal and hence causes
some disturbance to the neigbouring communication lines .
3. The ozone gas produced reacts with the conductor and
corrodes it .
ADVANTAGES : As the air becomes conducting so there is a
virtual increase in diameter of the conductor and henc
decreases the resistance.
2. It acts as a safety valve for neutralizing lightning
surges and overvoltages caused ddue to other transients .

using in R,Y& B PHASE LTSIDE(415V)ct ratio 4000/5 WITH ENERGYMETR OF 1280 REV./KWH,240V.WHAT WILL BE MF OF METRE.

1 Answers   HCC,

---

WHY DIODE IS CONNECTING ACROSS SWITCHES

5 Answers  

---

what is phantom load, Give any example

2 Answers  

---

PLease anyone can tell me CTUM-15 specification?

1 Answers   Gilbert Maxwell,

---

if the syncronous machine run at leading pf and as its field curret increased its armature current decreased is machine operate as generator or motor?

1 Answers  

---

placement paper samples of mspl company

0 Answers   MSPL,

---

HOW DOES THE FAN REGULATOR CONTROLS ITS SPEED

6 Answers  

---

What is corona ? Mention its positve effects .

1 Answers  

---

how we calculate the withstansing current capacity of wires&cables?

0 Answers  

---

how dc load convert to ac load

3 Answers   Sunpower Solutions,

---

what is the use of conservator in a transformer?

6 Answers   L&T, TATA, Tata Motors,

---

explain Density

0 Answers   TCS,

---