Answer / utkarsh agarwal

according to the data flux density is constant.
Pe1=f1^2 Ph1=f1
Pe2=f2^2 Ph2=f2

takinf f1=25hz
f2=50 hz
Pe1/Pe2=1/4
Ph1/Ph2=1/2

now iron loss Pi=Ph1+Pe1
Therefoe
1. ph1 + pe1=250
2. 2ph1+ 4pe1=800
solving we get ph2= 200w

P.S. : "=" is meant to be proportiaonality sign in first 3 lines

For a DY11 lighting Transformer on primary side whee to connect fourth lead? from nuetral or from ground?

3 Answers   Sabic,

---

what is the contact resistance of sf6 circuit breaker??

2 Answers  

---

What is the difference between line Distance protection and Line Earth Fault Protection?

1 Answers  

---

how to check regenerative load in drived motor

0 Answers   Hindustan Unilever Limited, NHPC,

---

What is correction factor in Tan delta test?

1 Answers  

---

WHAT IS THE DIFFERENCE B/W THREE POINT STARTER AND FOUR POINT STARTER

1 Answers  

---

A 200 KVA UPS's load current is 70 A. We want to provide a Generator back up. What capacity of DG required for this ?

1 Answers   Reliance,

---

What is the basic difference between synchronous machine and induction machiine?

1 Answers  

---

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

0 Answers  

---

circuit breaker work alone during fault condition or need any relays ?

4 Answers  

---

what is isochronous mod? what is voltage drop mode and p.f mode?

0 Answers   ABB,

---

Why mostly conductor made by 7 nos wire?

2 Answers  

---