Answer / rashid abdul rab

W= voltage*current*power factor
But in practical we are not well aware of the type of load
(power factor)to be applied on transformer. So we give the
ratings in KVA only

Answer / mohamed iqbal

There are 2 losses in transformer. One is copper loss which depends on current and the other is iron loss which depends on voltage. These two factors are not affected by the power factor. This is why transformers are rated in KVA and not KW. Single phase KVA = Amps x Volts/1000. Single phase KW = Amps x Volts x pf/1000. 3 phase KVA = Amps x Volts x 1.73/1000. 3 phase KW = Amps x Volts x 1.73 x pf/1000

Answer / anu

In transformer the copper losses are due to current and
iron losses are due to voltage. so that the rating of T/F
is in KVA instead of KW.

What is an electric arc?

3 Answers  

---

What type of bulb used in small size cross symbol boder and original flame type(Deepam)?

1 Answers  

---

Define phase cross over?

0 Answers  

---

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

0 Answers   Reliance,

---

Is it necessary to place tap changer in secondary winding or we can use on both sides?

3 Answers  

---

---

What is lc oscillator?

0 Answers  

---

why using touble tube lamp use in factory?

3 Answers   ONGC,

---

how the 12 pulse rectifier is made?

8 Answers   Engineers India Limited,

---

what is the meaning of vcc

0 Answers  

---

Why do we use 36KV LAS for 33kv line and 9KV LAS for 11KV line?

1 Answers  

---

What are the effects of electrical faults?

0 Answers  

---

What is CRT (Contact Resistance Test) for Isolators or Dis- connector Switches? Why we performed it & whats the Testing procedure.

1 Answers   Siemens,

---