Answer / pavan krishna

reactance is nature of either inductor or capacitor but
impedence is mixed effect of the resistor and either
capacitor or inductor

Answer / md. obaydur rahman

The impedance Z of an alternating current circuit is a
complex number given by Eq. (1).
1. Z = R + jX

2. Z = jL\omega = jX

3. Z = -{j\over C\omega } = jX
The imaginary part X is the reactance. The units of
reactance, like those of impedance, are ohms. Reactance may
be positive or negative. For example, the impedance of an
inductor L at frequency ω is given by Eq. (2), so X is
positive. The impedance of a capacitor C is given by Eq.
(3), so X is negative

When can we take Neutral as common neutral link?

0 Answers  

---

When we change the tap position of 10MVA transformer it suddenly tripped with Out of step indication and also with Static differential relay indication, Transformer Bucholz relay indn and Low oil level indication. Before 1 week the same problem occured by changing the tap position. but at that time only oltc bucholz relay activated. After testing the TxR Relay team & PET team cant find any solid reason. The values are ok also. So plz answer wat's the reason for this incident? anybody plz help.

3 Answers  

---

what are the standard values for resistances(Megger testing) between L&N, L&E and N&E (L=Live,N=Neutral, E=Earth)?

1 Answers  

---

without any theoretical calculations, can u approximately tell the current rating of a motor(above 30hp)working at 415VAC.

7 Answers  

---

Is necessary Protection CT, CLASS - 5P10 fitted at Incomer side of main Breaker ? Why ?

1 Answers  

---

How do we calculate conductor size?

1 Answers   Hero Honda,

---

how can we rotate a single phase motor (without cap.)in reverse direction?

2 Answers  

---

Why the airgap of an induction motor is less compared to that of a synchronous machine?

4 Answers   MGVCL, RRB, WebTech,

---

what happens if dc supply is given to the transformer?

10 Answers  

---

what percentage of marks in B-TECH is needed for section engineering exam

1 Answers   RRB,

---

how to calculate cable bending angle in a trench?

2 Answers   Eastern Cement,

---

What is the difference between earth and neutral

4 Answers   ABB, Tamboli Engineers,

---