Answer / arvind arora

ratings are depand upon heating.in transformer heating is
due to coreloss whitch is depands on voltage and copper
loss whitch is depands on currrent.losses do not depands on
pf. for example a x'mer working on rated voltage and rated
current with load pf equals to zero has rated losses and
rated kva output.so thats why its rating is in kva.

Answer / siva

due losses are in kva

Answer / william lobo

All transformers are rated in KVA or MVA if they are big
size. This is because it has a particular capacity and we
cannot utilise beyond this capacity. suppose you have
100KVA transformer; then you cannot use more than 100kva
capacity. If you do either transformer will burnt out or
the circuit breaker will trip.

why use phase displacement in transformer.and effect of phase displacement on transformer

0 Answers   IOCL, ONGC,

---

What is Peterson coil? Where it is used?

2 Answers  

---

when we r using single phase load and we have power cable of 3.5core with .5 of neutral and neutral is suppose to the returen path of the phase how much current will flow in the neutral.reply.

2 Answers  

---

Actuality I have at home electrical panel with 220v 50hz, and I want to converter from there to 110v 60hz, to wiring on the half of my house. Also I like to keep another half of my house with the original 220v 50hz. What is the best and safety way to do?

0 Answers  

---

what is relay what is protection & contact multiplying relays where it is used function in brief

0 Answers  

---

---

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???

0 Answers  

---

what is the natural resistance of the earth? and how it effected by rain r snow? wat is the natural resistance of wet soil? define natural resistance?

1 Answers   ECL, ISRO,

---

can i use ups power as a raw power for another ups

0 Answers  

---

during the period of armature reaction ,if the brush shift is not accomplish, what happen?

1 Answers  

---

What is difference between stable and steady?

1 Answers  

---

if 40 watt bulb has higher resistance then a 100watt bulb then according to joul farmula p=I^2R the 40 watt bulb more power consume then 100 watt bulb.

5 Answers  

---

A cylindrical wire is compressed in length by 10%. The percentage decrease in the resistance will be?????

0 Answers  

---