Golgappa.net | Golgappa.org | BagIndia.net | BodyIndia.Com | CabIndia.net | CarsBikes.net | CarsBikes.org | CashIndia.net | ConsumerIndia.net | CookingIndia.net | DataIndia.net | DealIndia.net | EmailIndia.net | FirstTablet.com | FirstTourist.com | ForsaleIndia.net | IndiaBody.Com | IndiaCab.net | IndiaCash.net | IndiaModel.net | KidForum.net | OfficeIndia.net | PaysIndia.com | RestaurantIndia.net | RestaurantsIndia.net | SaleForum.net | SellForum.net | SoldIndia.com | StarIndia.net | TomatoCab.com | TomatoCabs.com | TownIndia.com
Interested to Buy Any Domain ? << Click Here >> for more details...


why transformer rating is expressed in kva.

Answers were Sorted based on User's Feedback



why transformer rating is expressed in kva...

Answer / nitiniitp

kVA is the unit for apparent power. Apparent power consists
of active and reactive power. Active power is the share of
the apparent power which transmits energy from the source
(generator) to the user. Reactive power is the share of the
apparent power which represents a useless oscillation of
energy from the source to the user and back again. It
occurs when on account of some »inertia« in the system
there is a phase shift between voltage and current. This
means that the current does not change polarity synchronous
with the voltage. But the heat generated in a winding as
well as the eddy current losses generated in a transformer
core depend on the current only, regardless of whether it
aligns with the voltage or not. Therefore the heat is
always proportional to the square of the current amplitude,
irrespective of the phase angle (the shift between voltage
and current). So a transformer has to be rated (and
selected) by apparent power.

Is This Answer Correct ?    26 Yes 0 No

why transformer rating is expressed in kva...

Answer / rahul faye

there are 2 types of losses in transformer are core loss and ohmic loss...as these losses depend on voltage and current. and are almost unaffected by the load pf.. that's why transformer rating is expressed in kva nt in kw....

Is This Answer Correct ?    8 Yes 3 No

why transformer rating is expressed in kva...

Answer / lokeshraj

For t/f rating kva is used because at the time of
manufacturing of t/f we dont know about the value of the
cos(angle).As Power(KW)=kva*cos(angle).....
....Lokesh

Is This Answer Correct ?    6 Yes 12 No

why transformer rating is expressed in kva...

Answer / mrithun

The power factor of transformer is unity.
Since KW=KVA*cos(phi)
KW=KVA*1 (in case of transformer)
KW=KVA
So transformer is rated in KVA and not in KW.

Is This Answer Correct ?    3 Yes 11 No

Post New Answer

More Electrical Engineering Interview Questions

how many frequent start/stop operation possible in case of HT MOTORS.

5 Answers   DVC, Steel Plant,


How to calculate cable size? How to O&m of vcb?

0 Answers  


Batteries. What is the difference between Lead and Nickel batteries ?

0 Answers  


how much test voltage should applied for tan delta test.

2 Answers   Electrical, TATA,


Actually why the transformers ate rated in KVA.?

2 Answers   Torrent Pharma, XYZ,


we all know that in capacitor there will be no ay physical connection between the two electrodes of the capacitor ,and the charge is stored between these electrodes during charging , so with out any physical connection how these charge is transferred from one plate to the another plate during the discharge?????

1 Answers  


Define transfer function?

0 Answers  


For 7.5HP motor 2880rpm 415VAC Connected with Pressurisation Fan we used Star Delta Startor why not we use DOL startor

2 Answers   DLF,


hii.i am a B.TECH(EEE) graduate.i want 2 know wat type of qusns r asked in sbi clerk interview 2 candidates like me??kindly post answers ASAP..

1 Answers  


how much amps will get from a 360/11kv line

2 Answers  


Why hydropower is called renewable source of energy?

0 Answers  


How to calculate 5hp 415v 3phase 2800rpm Ac motor full load current with out tourgh

1 Answers   Siemens, Spatel,


Categories
  • Civil Engineering Interview Questions Civil Engineering (5086)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4456)
  • Electrical Engineering Interview Questions Electrical Engineering (16639)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • 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)