Answer / guest

Transformer EMF equation = 4.44 x Phi x f x N volts.
for same operating voltage if frequency is to be decrease then Phi must be increase.

Now Phi = Bm x A, where A is the Area of Iron Core
so it is clear that on decreasing frequency size of the transformer must be increase.

working principle of AC Servo Motor with its construction

0 Answers   TATA,

---

What is Earthing?

16 Answers   Essar,

---

Which Class insulation is prefered for the sandwich Busducts ? Why?

0 Answers  

---

what is tertiary winding in transformer?What is its purpose?

18 Answers   Bhel,

---

NOW A DAYS THE POWER SUPPLY IS VERY LOW.SO THE FLURESCENT TUBE LIGHTS ARE VERY DIM.IS THERE IS ANY WAY TO INCREASE ITS BRIGHTNESS?FOR EXAMPLE ANY CONVERTER,CONDENSER?

1 Answers   Bhel,

---

what is the voltage rating of chiller unit sensors

0 Answers   Voltas,

---

A 11KV, 1200 A breaker combination fixed in a cubicle for HT motor.Is normally for 11 KV motor fuse is using? if Yes, What range fuse is required?

0 Answers  

---

What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

0 Answers  

---

How could I get a certificate of competency as Electrical Supervisor? I have completed By BTech in Electrical this year(2012) for VJTI Mumbai Maharashtra. Is it compulsory to be produced while joining?

0 Answers   ONGC,

---

Size of the 60Hz and 400Hz transformers is a) same b) 60Hz Tr s larger than 400Hz Tr c) 400Hz Tr s larger than 60Hz Tr d) None of the above

5 Answers   Ecil,

---

how many types of cbs?with pcific ratings?

1 Answers   Bhel,

---

What is the purpose of stablization resistor in high impedance bus bar protection

0 Answers   Jindal,

---