Answer / k.prakashchandra

At the beginning of positive half cycle, the capacitor draws
peak positive current ,hence it is taken as leading and in
case of inductance the current is negative peak , hence
taken as lagging.In pure resistance, the current is in phase
with voltage.

Answer / keerthana

The reason that current leads voltage in a capacitor is
rooted in the way a capacitor works. Picture the capacitor.
It's basically two conductive plates separated by a short
distance and having a dielectric (insulator) between them.
Now, let's specify that our cap (capacitor) is completely
discharged and we'll hook it up to a DC voltage source
through a switch. Flip the switch on and current will begin
to flow, but it is important to look at what happens in just
the first instant of time. Electrons will begin to
accumulate on the negative plate and their presence there
will drive electrons off the positive plate. The capacitor
is building up a charge. It is developing a voltage across
(or between, if you prefer) the plates. But electrons have
to begin to pile onto the plate to actually create the
difference of potential (voltage) between the plates. The
moving electrons (and that's current) that are piling on the
plate are already beginning to flow before the voltage is
developed between the plates, so current is said to lead
voltage in a capacitor.

Answer / gesan

The capacitor offers more impedance( Resistance + Inductance)

Where the excitation is given either stator or rotor in actually in power plants?

8 Answers  

---

In CDG type IDMTL realy O/L , E/F, O/C which are used for out going feedrs,on R-phase o/c element, Y-phase , e/f elecment and on b -phase o/c element will be connected . Why the earth fault on center phase only, why not on other two phases?

2 Answers  

---

why the Parameters : Base Voltage & Maximum Voltage can't be equal in value in a VFD (Variable Frequency Drive) ? How much the base voltage would be lower than the maximum voltage ? If 400 V is the 3 phase output of a VFD ... then what should be the base voltage ? thanks a lot

1 Answers   Yaskawa,

---

SIR I AM GOING TO TAKE PART IN JINDAL ENTRANCE XAME OF 4TH OCT. PLEASE SEND ME SAMPLE QUESTIONS FOR THAT ON MY ID JITENDRA1603@GMAIL.COM

1 Answers  

---

What do you mean by Stimulastion Test in Diesel Genarator / Why & when it's conducted ?

0 Answers   JLL,

---

Which transformer is suitable for 220/11 kV, 60 MVA, distribution , Y-Y or D-Y or Y-D, give comparison for the same.

3 Answers  

---

why alternator is used instead of dc generator and induction generator

1 Answers  

---

what is a bus post insulator? explain its application in a substation.

1 Answers   Enercon, HAL,

---

what we happen if 400 kvar cpacitor banks are on in manual mode and there is no load on mains ??????????????

7 Answers   HCL, Reliance,

---

A charge of 240 C is transferred in 2 minutes. The current flowing is:(a) 480A(b) 120A(c) 2A(d) 8A

2 Answers  

---

Dear sir, my knowledge about cable size determination is limited. Though I read examples I could not calculate the Cable size required for electric driven pump 40 KW, 380 Volt, 50 HZ, 50 meter from transformer and it is three phase star delta starting. Please help as there is no one in my surroundings to help.

0 Answers  

---

X/R ratio in 11kv transmission line is?

1 Answers   RRB,

---