Answer / vijay shinde

transformer rating is in kva because iron losses are
depends on voltage of transformer and copper losses are
depends on current of transformer so its in kva

Answer / praveen420

rated transformer o/p is limited by heating and hence by the losses in transformer.mainly two type of losses occur in transformer iron loss and copper loss.iron loss depend on voltage and cu loss on current(amp)and these are almost unaffected by load pf so rating of transformer expp.in kva,va rather than kw.
w=v*i*cos(angle) in case of AC.
w=v*i in case of DC

Answer / kingshuk dey

This is one of the sure questions of graduate interviews. I'll try to explain it in the simplest possible manner , using least technical words and more "English". :D

KVA is the power available for use. KW is the power that is actually used. Transformer is a source of power and supplies to the motor (consumer of power).
KW=KVA *cos(phi).
This "cos (phi)" or power factor is the efficiency in which the electrical system is utilizing power. cos (phi) is 0.85, means the system is 85% efficient. The rest 15% power is being wasted as heat etc. This factor only comes to play when there is a complete system (producing power and consuming power).
Hence transformer is rated as KVA and motor KW (cos phi comes into play in KW to specify it's efficiency to use the KVA power generated).

Answer / lalgpt

Transformer rating is always on KVA that is
Kilo Volt Ampere Simply Volt ampere

but equation of power is VICos()

And the transformer has two losses one is copper loss
and the other is the core loss these two losses
are depending on current (I) and Voltage(V) only not
on Cos() that is why rating is in VA

Answer / pratheesh

Transformer is a power source(supplier) whicah can
deliver X amperes at rated voltage. So units of these
values are Voltag(V) and Current(I). It means all the
power delivering equipmets such as Transformers and
Generators are supplying I ampere at V voltage. Thats y
its rating is V*I == V*A

Power W= V*I cosQ.
Not V*I. (It is in DC)

Answer / guru

Transformer is mere equipment which transforms the voltage
and current as per the requirement. KW are rated for
equipments which converts electrical energy to other energy.

Transformer rating in KVA is due to it converts electrical
energy to electrical energy and all electrical ratings are
done only in voltage and current or combination of both,
like CB rating in Voltage and current, Bus bar rating in
amperes etc.

What are the main parts of central chiller plant? Explain the function of each stage.

0 Answers   HSL, Shankar Electricals,

i am gng to visa interview this july i have 4 backlogs gre 1010,toefl 75,pls give me the tips pls pls

0 Answers  

State the factors, for the choice of electrical system for an aero turbine.

0 Answers  

(1) From the following option, which option is correct for largest size transformer.? a)1KVA,25Hz , b)1KVA,50HZ , c)1KVA,60Hz , d)1KVA,100Hz

5 Answers   Torrent Power,

What is VVVF Drive ?

3 Answers  

please send me latest & previous years question papers for IOCL Technical level questions

0 Answers  

what is the difference between 230v and 115v?

1 Answers   Bhushan Power Steel,

why we use 6nos of C.Ts on 11kv incoming?

2 Answers  

In a incandescent bulb, if the glass is punctured, and then power is supplied, the tungsten filament blows up with a flash.Why?

2 Answers  

i have interview in Pepsi company what type of question will ask please send the question and answeer

0 Answers   Pepsi,

can we use HPSV LAMP in HPMV LAMP fixture ?and viseversa.

5 Answers   OPS,

what is G.O.D.S. ?

2 Answers   RCE,