Answer / rajkumar

for making -more time
for breaking-less time why?

when moving contact starts leave from fixed contact
during breaking at that time arc will develope this arc
follow to the moving contact upto rest position of the
contact but arc quench media didnot allow this process
incase breaking cpacity is more means arc presence in
between contact is long time so it is damage the breaker

during making moving contact touch or very near to the
fixed contact on that short time only arc produce

Answer / sudheer

because of the inductance associated with the circuit, it
takes time to establish magnetic fields around all the
wires and whatnot. This requires extra current at startup.

Answer / kumar

when we make the circuit ON at that time a suddern inrush
current the steep traveling current wave) flow to the
network or to the device due to the presence of circuit
parameters like as inductance, capacitance. that time the
current value is more than the breaking current.Thats why
the making capacity is more than the breaking capacity.

Answer / guest

if any fault is create in systeam at the time breaker must
be open in within seconds ( it is 2 to 3 sec. )otherwise
very denger fault is create and we loss a very costly
equipment.

how much current carry a 3-1/2 core of 100mm size cable.explain it with solution

2 Answers   ACS,

---

what is the different between second harmonics and third harmonics ?

1 Answers  

---

In a poly phase circuit if clamp on meter shows same load on three phases and their sum on neutral then why we use three and a half core cable or maximum the same size of core as that of phase?

1 Answers  

---

what is the proximity & ferranti effects can you explain to me

1 Answers   APTransco,

---

what is transformor oil gread

0 Answers   Idea,

---

why in large rating C.T.s equipotential wires are used?

2 Answers   Essar,

---

A 25MVA 3300/400V T/F is termed as per winding is …… a) primary 3300V & Secondary 400V b) primary 3300V & low voltage winding 400V c) High voltage winding 3300V & Secondary 400V d) High voltage winding 3300V & low voltage winding 400V

4 Answers   Engineers India Limited,

---

why the 4 terminal are named as main, line, common, voltage (M, L, C, v) of a wattmeter?? why not its nameed as A,B,C,D??

6 Answers   Jindal,

---

i need mat lab program to find out the transmission line losses,regulation and losses

0 Answers   AITM,

---

Differentiate between power relay and reverse power relay?

2 Answers   ABB, TVS,

---

How to size fuse? How to size MCB?

0 Answers  

---

When the relative speed between the magnetic fields of stator and rotor does is zero under steady state operation?

0 Answers   HPCL,

---