Answer Posted / rajesh babu

we cant use dc power in transformers.AS the transformer
works on the principle of MUTUALLY INDUCTION and according
to this principle induction of emf(STATICALLY) occurs in one
coil due to change in current in another coil.THIS WILL
,ONLY POSSIBLE WITH ALTERNATING CURRENT.

How much voltage we need to apply in 33kv cable during hipot test of cable

842

---

Does all the output contacts (N/O as well as N/C) of a Numerical relay operate when relay receives a binary input/inputs or contacts are designated to specific logic input/inputs and only these contacts operate?

2076

---

earth also having a gravitational force (magnetic field of north and south)but it attracts any object compare to this theartifical magnetic cant perform same as earth why?

1961

---

what is the principle of operation of tungstun bulb ??

1821

---

what is the min and max ohmic resistance for the earthing rod installed for lighting poles for street light network

3783

---

How phase to phase voltage comes 440V.

2082

---

Actually I have a doubt on neutral and earth.we use Ac power without taking neutral by connecting to earth,but at that time does it affects on efficiency of any electrical components or no? If yes how?

1393

---

Usually in the L & T make MCC feeders' power circuit,we have BMR after the MAIN CONTACTOR.,can we interchange their position, keeping the control logic same???

2092

---

Which type of transformer is used for lighting loads?

1128

---

how we calculate electrical load on a building according to area?

2787

---

Define active and passive network?

1138

---

what are the different methods for the starting of a synchronous motor.

1129

---

what is destructive and non-destructive testing of welding

1662

---

What is the difference between isolators and electrical circuit breakers?

1176

---

If the earth is a good conductor of electricity, why don't people get shocked every time they walking on earth?

1797

---