Answer Posted / kj

A 3 phase supply is the lowest number of phases where a
rotating field is produced. No extra starting controls are
needed (e.g. capacitor start or start windings)
Two phase systems have been used and can produce a rotating
field but it has to use a setup with separate neutrals for
each of the 2 phase. It therefore requires 4 wires to each
motor instead of 3 and it is also not as efficient.
Three phases also has the advantage of the currents in the
nuetral not being the sum of the 3 phase currents. In that
way only a single neutral can be used as the return for any
single phase load on all the 3 phases.

What is the practical way to calculate the cable size for known ampere load?

1442

---

What is cathode ray oscilloscope (cro)?

1132

---

why dimmerstate always connected in star connection? what will happen if it connected in delta?

2070

---

why we not used 11kva as a direct our electrnics component.

2821

---

how i chosse capacitor bank if my energy meter is 48 kvr? tell me capacitor bank chossen formula?

2352

---

How line capacitance & line inductance varies with increase in height tower.

2343

---

what is the diference between the 4pole & 6pole DC Motors & what is advantage 6pole over the 4pole ?

2018

---

what is accuracy ? in any meters , coils accuracy . how can u defined that ?

2427

---

What is the difference between the transmission line and distribution line?

1174

---

Is there any Institution for giving M-tech in Electrical engineering for those who r in service? Give the details please.

2080

---

what is meant by IGBT how they differ from tyristor ?

2446

---

What is the power factor of an alternator at no load?

1347

---

what will be the effect if you were using different brands of outlets?

1927

---

what is the diff. between x'mer , isolation x'mer & ultra-isolation x'mer ?????????????

2355

---

If mutual flux is 1.2wb & power factor is 0.8 lag , then what is the Useful flux of a transformer?

4494

---