Answer Posted / sukhdev negi

Abobe two reply explained correctly "what is vector group".
The answer to the last question "why it is needed" is as
follows:-
By virtue of constrction & terminal connections of the
transformer, a phase difference between primary vector &
secondery vector occurs. We need to know the same for the
following reasons:-

1)Matching of vector group is required (to avoid
circulating current/ fault ), when 2 transformer need to be
operate parallal on a common bus/system.

2) to provide transformer differential protection correctly.

What are the basic component of a cro?

1251

---

Why sometime AVR and sometime Booster coil is used in Alternator? what is the diferance between AVR & Booster coil due to which they are selected

3132

---

how to get electrical supervisor competency certificate in gujarat. i did 3 year diploma in electrical

2576

---

Explain about p.t?

1087

---

What is knee point voltage of transformer?

1144

---

why we use Test Terminal Block in 11 KV and 33 KV electrical panels.

1379

---

how can you size an automatic voltage regulator?

2365

---

Can anyone explain me about the RLC based Impulse high voltage generator and how to and operation of Series resonant High voltage reactor...?

1945

---

What is Auto Mains Failure Panel & Auto Synchronizing Panel

1944

---

If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.

1642

---

The loads are connected with phase and ground then why current flow as the loads ?

1976

---

What is the drawback of class b amplifier?

1181

---

What is the type of feedback used in an op- amp schmitt trigger?

1032

---

plz send me the placement interview question and answers of whizchip(technical and apttitude)..i have an interview in next.

4996

---

In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring

1978

---