Answer Posted / r.p.samy, national switchgears

Pl check how the winding of motor is connected . Whether it
is Star or delta we have to use 4 probe Ohmmeter ,
preferably injecting a current of 10A . The resistance can
be accurately measured

if we look on phasor of the transformer vaoltage is 180 oppsite at primary and the secondary so to improve a power factor is secondary should kept negative to improve it primary side means is -.90 became +.90 at other side

1856

---

2- What are the percentages between excitation currents in phase (R, S and T) in ∆ and Ỵ connections in excitation Current test in transformers?

2013

---

What is tranformer differtial?

2021

---

Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction

2947

---

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

1647

---

What are the material used for resistor?

1116

---

where reactive power is used

2051

---

What are the basic properties of signal flow graph?

1212

---

what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?

1968

---

75 kw motor take 45 amp in no load delta in star 10 amp but in load it will take 160 amp but IR velue of winding above 500 at 1kw ph to earth and ph to ph. what problem it should be?

3722

---

IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?

4138

---

What are test signals and their significance?

1132

---

hi i have applied for lic of india south cenrtal zonal ,hyd. i didnt get hall ticket till now.let me know how can i get form internet

1999

---

I need bhel electrical test pattern & paper

1851

---

What is the function of electron gun assembly used in crt?

1184

---