Answer / ssreenu207

above answer is correct and the reason is coronal occurs
only in air at high voltages because of ionisation of air
around the conductor.

Answer / magendra

no corona does not occurred in induction motor.

Answer / jagat

corona doesnot occur in induction motors because for corona to occur it is necessary that a certain p.d must be created between the wires for ionisation of the medium. But in case of induction motors the electrical wirings are insulated from each other thus preventing any corona which would lead to short circuits.

Answer / sunil keluskar

High Voltage motors are Induction Motors and in HT motors we are putting conducting tape over the slot area of a coil to reduce the corona effect and semi-conducting tape at the slot end portion of the coils.....

Corona effect occurs in Induction motors

In power point wiring,often,we use less size of earth wire compared to phase & neutral wire and we use big size pin in pug top. how is it justified? can we use small size cable for earthing?

3 Answers   HAL,

---

draw the block diagram of fire alarm?

0 Answers  

---

How to calculate Busbar Thickness for Different type of HT/LT panels

1 Answers  

---

What is the electrical difference between Earthing Switch (ES) and Maintenance Earthing Switch (MES)?

1 Answers  

---

What is mean by spike arrester(Voltage Operated)

0 Answers   Siemens,

---

Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

---

I have been short listed for sydicate clerkcal post .i have interview on 15th sept..i want to ask if i don't know kannada to read and write they won't allow me to attend the interview?Do send u r reply.......

1 Answers   Syndicate Bank,

---

What is MPCB, MCCB, ELCB, RCCB ? Explain them ?

2 Answers  

---

what is the reasons for blowing fuse

1 Answers  

---

what is the meaning of WYE and DELTA in Electric meter?

0 Answers  

---

Does power factor vary with speed?If yes, how?If not, why?

4 Answers   Genco,

---

which have higher efficiency transformer or induction moter

8 Answers   BARC,

---