if transformer winding burn on dc supply then
why not alternator rotor winding please post
answer on y.sakhare@rediffmail.com

Answers were Sorted based on User's Feedback



if transformer winding burn on dc supply then why not alternator rotor winding please post answe..

Answer / anil

there should be a relative motion to induce an emf i.e
either a rotating rotor field with dc or alternating supply
to the stationary core in case of transformer if we give
constant dc than there is a constant flux linking with the
secondary which will not produce any emf in secondary and
thus since there is no opposition to the primary emf and
the resistance of winding is very small this will lead to
high currents in primary and thus may lead to the burning
this is not in case of alternator since the rotor is
rotating

Is This Answer Correct ?    12 Yes 3 No

if transformer winding burn on dc supply then why not alternator rotor winding please post answe..

Answer / yogesh

every conductor produces magnetic field around it when you give ac or dc supply.but in ac supply the flux is alternating which produces self induced emf in winding which opposes supply vtg so currunt limits.but in dc supply there is no self induced emf.so when dc supply given to xmer no self induced emf produced to limit the current and in alternator or dc motor there also no induced emf produced but to limit the current the winding resistance made high ie above 100 ohms wheres xmer wdg resistance is in points range ie 0.1 ohm etc

Is This Answer Correct ?    8 Yes 1 No

if transformer winding burn on dc supply then why not alternator rotor winding please post answe..

Answer / antaratara ghosh

With reference to the ans#2, the impedance of the
transformer is mostly inductance whereas in sync m/c it is
resistive...so if we apply a dc voltage in trafo, there
will be no inductance and the total impedance becomes very
very small.. thus I=(E-V)/Z will be very high for
trafo...due to this high current trafo windings will burn
but not sync m/c....

Is This Answer Correct ?    0 Yes 2 No

if transformer winding burn on dc supply then why not alternator rotor winding please post answe..

Answer / k.prakashchandra

The windings in both the cases will not burn out if the
cooling is perfect.When it comes to motors or gen, it is
advisable to specify whether field or armature instead of
just rotor or stator.In case of large HT gen, the field is
the rotor.When Dc is applied and current is =V/DC
resistance.The same with the Tr.At the rated DC current, the
heating in tr will be less as there are no iron losses.

Is This Answer Correct ?    0 Yes 10 No

Post New Answer

More Electrical Engineering Interview Questions

In Panels Main Incomer considered should be TPN or FP?

2 Answers  


if two transformers are parallel & both have fault short ckt. impedance of 50KA in each case will it increase or decrease show example?

1 Answers  


have u any web site who can give all electrical sum's to solve counting easy like how to convert 1kw=?Kva.

1 Answers   Marriott,


why we do not get the electric shock at end of returning water of water cooled cable

1 Answers  


plz tel me syllabus and exam date 4 jr executive engg (electrical)

0 Answers   AAI Airports Authority Of India,






what is Fan Control Cubicle

0 Answers  


what are the C&D CHECK OF DG set

1 Answers   HCL,


Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close?

0 Answers  


What will happen if 2 phase supply is given to 3 phase motor?

4 Answers   ABC,


What is meant by SMPS how it working ... and where it used

2 Answers   MTS,


why in power staions distriution r like 11kv,33kv,66kv in india?

4 Answers  


ganaretors A check B check and C check details

1 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)