Answer / n.p

P.F is the ratio of true & apparent power. formula of p.f
=kwh/kvah ( kwh & kvah reading taken from ht mtater)

what is the advantage and disadvantage of billing in kwh and kvah by electricity board .

6 Answers   Nespak, NTPC,

---

what is daiod

4 Answers  

---

we need a ntpc previous papers

0 Answers  

---

what is earth resistance? how to measured? and give values at power station and mcc area?

0 Answers   Essar,

---

In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and the other 230v,200w are connected between r phase- neutral and y phase-neutral respectively. If neutral wire breaks which lamp will fuse first and why?

3 Answers   Eskom, SSC,

---

hi guys please tell me the procedure for mesuring the coil resistance of 3ph induction motor?

0 Answers  

---

In electrical locomotive engines, the DC series motors is being used as traction motor. But in new engines like in WAP7 & WAG9 the 3-phase squiral cage induction motors has replaced them. So can someone tell me the advantages of induction motor over dc seris motor in engines points of view....???

0 Answers   RRB,

---

why the starting voltage drop in a cable needs to be limited?what is percentage of the voltage drop allowed during starting?

0 Answers  

---

Why we Specify Transformer rating 433 V Instead of 415V ?

8 Answers   ABB, ERA, Uddans,

---

what are the basic concept to design a out door Substation?

1 Answers  

---

we all know that in capacitor there will be no ay physical connection between the two electrodes of the capacitor ,and the charge is stored between these electrodes during charging , so with out any physical connection how these charge is transferred from one plate to the another plate during the discharge?????

1 Answers  

---

What is quadrantal symmetry?

0 Answers  

---