what is ideal insulator. what are its parameter. Is poecelain insulator comes under this category.

3 Answers  

---

A transformer has negative voltage regulation when its load PF is A zero B unity C lagging D leading

1 Answers  

---

what is meant by skin effect ?

3 Answers  

---

What do you mean by a phase angel of instrument transformer?

0 Answers  

---

why motor range is available 22kv,30kv,37kv,45kv and so on? why motor range is not available 21kv,24,25,26,27kv and so on?

0 Answers   Government, PSU,

---

Maximum efficiency occurs in electrical machines is at i)Full load,ii)50% of full load,iii)Near full load,iv)None of these

1 Answers   IFFCO,

---

Can the efficiency of transformer be measured with the help of wattmeter readings taken at primary and secondary side? Support the answer.

2 Answers  

---

for ac networks if the voltage wave form is V=Vm sinwt here the voltage Vm=230 for the frequency 50hz then the time period is 0.02 sec then for the time period 0.12 sec what is the voltage

4 Answers  

---

What is meant by Im=30mA@Vk/2. How to know the kee point voltage for CT design

0 Answers  

---

which part of transformer heats up the most and why? windings, core or oil .

3 Answers   Lafarge,

---

what are trouble functions of transformer?ex. prv trip,oltc,oti,wti.explain detail.

1 Answers  

---

Why corona leads to production of Ozone and glow of the color VOILET?

0 Answers  

---