Answer / nishant

due 2 magnetostriction

Answer / kowsar shaik

Transformer noise is caused by a phenomenon called
magnetostriction.if a piece of magnetic steel sheet is
magnetized it will extend itself.A transformer is
magnetically excited by an alternating voltage and current
so that it becomes extended and contracted twice during a
full cycle of magnetizationThis extension and contraction
is not uniform, consequently the extension and contraction
varies all over a sheet.so noice forms in all sheets of tf.

Answer / kalidass

While giving the ac power to the transformer the core will
compress and elongation. Due to this noise is come.

Answer / er. rinku

mostly transformers r making noise during its runing
conditions bcoz transformers operate at high frequence due
to this reason the size of the core changes and trasformers
makes a humming sound

Answer / sreenath

due to electrostriction,there is a uneven extension and
constraction in transformer core due to this transformer
subjected to noise

Answer / praful nandankar

The magnetic core elongates and contracts due to the effect
of magnetostriction as the input to the transformer is ac .








praful nandankar

Answer / khyber faqir

when we hear a sound from a transformer it means there is
conversion of energy from one form to ohter form .
core losses are devided into tow components in a
transformer
1-eddy current loss :that cause the transformer to be
heated
2-hysteresis loss that cause the transformer to produce a
sound.

Answer / devender sangwan

due to the presence of third harmonics present in the ac input supply.

are you hear the meaning of burden , excat meaning of burden in only one word

4 Answers  

which %age of corona losses increses if frequency is increased to 25%.

3 Answers   ADCET, Maihar Cement,

how many current required for hypo test

0 Answers  

The coulomb is a unit of:(a) Energy(b) Voltage(c) Power(d) Quantity of electricity

1 Answers  

I had finished D.E.E.E at 2004,I wish to take C license.I am working pvt company HT supply but my professional certificate was missing.I have diploma & course completed certificate.without professinel may I got c license?.pls guide me.

1 Answers   OEG,

is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

3 Answers  

defination of a.c filter

0 Answers  

why the secondary winding of the transformer is not open circuited ?

5 Answers   Nepal Electricity Authority, Torrent Pharma,

1.Why sinle phase motor is not self starting 2.working principle of alternator 4.list out electrical formula

2 Answers  

what is the opencircuit tes &short circuit test in transformers ,why you need this test, in poen your connecting which votmeter why?

1 Answers  

In radial network the source is fed from 1 end both ends at central

0 Answers  

EXPLAIN THE TRANSFORMER MAINTENANCE?

0 Answers   Enercon, ERT, GEL,