Answer / hirak patel

bcoz,in trans... Copper loss present in coil due to current and iron loss present in core due to voltage,so consideration of both(vol & current) ,the rating of transformer given in KVA,

Answer / ritesh patel

bcz in transformer two types of losses
may occure they are copper loss and
iron loss. Copperloss depends on current
and ironloss depends on voltage. So the
rating is in kva or mva.

Answer / hayanan

The rating of any machine is given by its heat handling
capacity.Heat in a transformer is due to temperature rise
which is due to the power losses. These losses are constant
losses (core losses) and variable losses (copper
losses).Core losses are constant as they depend
proportionally on the system voltage which is
constant.Copper losses are variable as the load on the t/r
varies and hence the current varies.These two are
represented in VA rating which is apparent power.

Answer / sai

in transformer the losses does not depend on power factor so
it is mentioned in kva

Answer / bimal sarkar

Copper loss in transformer due to current and iron loss due
to system voltage. There are no phase angle between voltage
and current so not depends on load power factor. So total
loss of transformer depends on volt-ampere (VA).

Answer / abhi

The real power(kW) also
depends on power factor on
load side,which varies frm
place to place,while the
apparent power will be cnst
at any place.

Answer / shashank

Capacity of any machine is always specified in terms of its
apparent power handling capacity not just real power because
because both real and reactive components ensure power
transmission.

Answer / g s panda

The angle between voltage and current in primary side is
nearly equal to the angle between voltage and current in
secondary side. So there is not any need of power factor in
describing rating of transformer

why the transformer neutral give to the earth ?

2 Answers   Jindal, JLL,

Where can I get CPWD electrical shedule rates in web? please help me.

1 Answers  

How transformer winding & oil gets heat.

3 Answers  

derive DC RMS value for half wave rectifier?

0 Answers   BARC,

what material used made for the resistance,for the purpose of zero temperature coefficient?

2 Answers  

why the name trunking bus PT

0 Answers   Siemens,

why magnet has north and south poles only why not east and west and why we are considering as north and south poles? why cant we consider as east and west?

0 Answers  

Actually I have a doubt on neutral and earth.we use Ac power without taking neutral by connecting to earth,but at that time does it affects on efficiency of any electrical components or no? If yes how?

0 Answers  

electricity bill multiplication factor 487.20xconsumption=total unit in kwh. what is 487.20 ?

1 Answers   Spec International,

Advantage of LT panel vs HT panel

0 Answers  

If you don’t have coal, salt and copper, then how would you earth your connection temporarily at a camp site.?

0 Answers   Bajaj,

If I fill the form of engineering services and I left the exam de to navoidable reasons . Will it counts my one attempt

2 Answers