Answer / doss

actually there is both positive and negative voltage occurs in the phase(phase line) with respect to the neutral line. this speed of positive and negative voltage variation is purely depends on the frequency of the ac supply. that is during positive half cycle of ac supply the phase line is positive with respect to the netral line. and during the negative half cycle of ac supply the phase line is having a negative voltage with respect to the neutral line(i.e. neutral is positive voltage with respect to the phase line during negative half cycle of ac supply). so we cannot define positive and negative terminal in case of ac supply since the same terminal can act as positive in one half cycle and during other half cycle the same terminal act as negative. so we simply say it as phase and neutral.

Answer / surendra

load safty is responsible for all these classification.. as
in case of dc there is a permanent neutral.. in ac there
should be a neutral.so that more variation in voltage we can
get..and load can get reliable voltage .........

Answer / ramkumar

in ac we will be getting supply only in one terminal which
is called phase. in neutral there is no power supply. the
general meaning of neutral itself nothing... but in case of
dc we will be getting supply in both the terminals. one as
positive and one as negative.

Answer / samarpal singh

No polarity in A.c

What is a compensator?

0 Answers  

---

Explain RLC circuit?

0 Answers  

---

How short circuit MVA(Fault MVA) in a power system calculated for calculating number of earth plates ?

0 Answers   NA,

---

Dear all, I'm manikandan I have done by DIPLOMA EEE from 2011 , I have 5 years of experience from Power plant instrumentation field , which one field is give long life & which one field is best ,I confused a lot and also I'm studying AMIE, can I choose which department from Section B examination? pls tell me

0 Answers  

---

Why we use Delta connection in the secondary side of a High Voltage transformer?

1 Answers  

---

how can we minimize the off load losses of a distribution transformer which is required to be energized 24x7 ?? capacity of the T/F is 1250 KVA and off load losses are around 2.0 KW.. can we use capacitor bank at the secondary of such a T/F to overcome off load losses? please elaborate briefly...thanks

2 Answers  

---

in a plug point why the hole size at the top is large?

9 Answers   Bhel, TCS,

---

three owners X, Y, z owned some tractors with them, on the first month x gave away the same amount of tractors to y and z ( as much as they possed), similarly in the 2nd month y gave of to x and z similarly by third month z gave to x and y. after this all X, Y, Z had 24 tractors each.

2 Answers   econ,

---

How can we check ELCB trip current sensitivity How can we check earth resistance value

2 Answers  

---

In a 11kv/433v transformer,at the LT side ie 433 V side why do we need to put 3.5 core Cable upto Panel.The full load rated Amps is 666 at LV side.What value of current will flow through the Nuetral Conductor.Why can't we use 4Core Cable instea of that?

2 Answers  

---

how can we test the polarity of a 3-phase transformer?

2 Answers  

---

what is pole slip ?

4 Answers   NTPC,

---