Answer Posted / rajan singh tanwar(j.k. cement

For Power
Transformers the
following Pre
Commisioning tests
are done:-

1.Visual Inspection
2.Measurement of IR
Value
3.Measurement of P
I Value
4.Measurement of
Winding
Resistance
5.Short Circuit Test
6.Oprn Circuit Test
7.Magnetic Core
balance Test
8.Voltage Radio Test
9.Oil BDV & Acidity
Test
10.Checking the
function of
OTI, WTI, OSR, MOG,
PRV
Relays
Last one for the
relay's testing but
it also comes under
transformer testing.

Thanks

What is the effect of positive feedback on stability of the system?

632

---

What is a dominant pole?

685

---

How to calculate VCB rating for 33KV ,25 MW Power line?

1250

---

Application Comparison between 22KV (UE)and 33KV (E) system. Are we allowed to use 33KV (E) cable in lieu of 22KV (UE) cable. What are the technical disadvantages.

2295

---

my diploma certificate in my higher education college

1207

---

---

What is the actual meaning of thermal power efficiency ?

1595

---

armature is that part in which current is induced since in dc motor we supply current to the conductor so why we call it armature?

1425

---

What is the polarization index value ? (Pi value)and simple definition of polarization index ?

762

---

diameter of cable and core is doubled then the value of capacitance is

3702

---

difference between a diode and thyristor?

1775

---

what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?

1488

---

Disadventage of cable-gland earthing if any ?

1668

---

What are the advantages of vscf wind electrical system?

645

---

in control scheme dc logic wiring commonly using negative loop,what is the reason?if we use positive looping what will happen?

1863

---

sir i am apearing for nic exam.i dont know exam pattern.can you please send me some model papers

1505

---