Answer / arpit gaur

because d.c have constant magnitude,if we give supply to the primary winding the flux produced in the core will noy vary therefore no emf will induced in the secondary winding....

Answer / sunitsaini@interview.com

bcoz d.c. is not sinosodial and the current is not change so

Answer / muhammad shoaib

because dc cann't produce flux so no current produce on the
secondary coil of the transformer.

Answer / shahin azad

transformer works on the concept of induction(mutual
inction);if we supply voltage at primary side of a
transformer secondary side of it is induced by the primary
side. and induction is produced due to random magnitude of
current inside of it. DC has a constant magnitude which is
unable to make a magnetic flus/ induction.
That's why transformer cant work at DC.

Answer / vinod yadav

transform work on the principle of electro magnetic induction which states that when an alternating current applied across the primary winding of transformer then an alternating flux will produced which link to secondary winding of transformer results in emf generated in secondary winding , if secondary winding is closed then a current start flowing .
if we apply dc then flux will also produced but it is not alternating type which is most important condition for the operation of transformer

what exactly commisioning work does in electrical site work... LT side?..

0 Answers  

in electrical fire which group fier Extinguisher as used

6 Answers  

what is the difference between earthed system and unearthed system.. where do we use unearthed system because in electrical catalogues always cable for earthed and unearthed system is given..pls elaborate

3 Answers  

how ti maintain the power factor in power generation

1 Answers  

what is voltage rise and voltage drop?

8 Answers   HP, jetking, TCS,

what is cable meggering formula for low voltage ?

0 Answers  

why it is necessary to maintain frequency constant in a power grid ?

1 Answers   NTPC,

figure of phasor diagram of transformer when full load or no load ?

1 Answers   Swastik, TCS,

what is power

6 Answers   ABB,

which tap of the transormer you will use in critical condition(worst)?

1 Answers  

why we are connecting the alternator to a steam turbine of higher RPM then the rated RPM of alternator? For example:( connecting 1500 rpm alternator to 7600 rpm steam turbine). we can directly connect the same rpm turbine to alternator know??? is there any special reason ???

2 Answers  

what use can we make of 3rd harmonic component

5 Answers   Bhel, General Motors GM,