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Question
Why Transformer in KVA?
 Question Submitted By :: Gaurav
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Why Transformer in KVA?
Answer
# 1
actually rating of the machine (kva or kw) depends upon the
power factor since the load power factor to which
transformer is supplying power is not known , it may be
capacitive ,inductive , or resistive that is why its rating
is in kva and not in kw
 
Is This Answer Correct ?    242 Yes 81 No
Manoj Kumar
 
  Re: Why Transformer in KVA?
Answer
# 2
The unit of voltage in Volts
The unit of current in Amperes
When the energy transfer from primary ciruit to secondary
circuit power is constant. there is no involvement of power
factor. Due to this transformer rating in KVA not in KW
 
Is This Answer Correct ?    89 Yes 132 No
Naresh
 
 
 
  Re: Why Transformer in KVA?
Answer
# 3
As we know Cu loss depends on current & iron loss depends
on voltage and not affected by power fector hence always
transformer ratting defined in KVA not in Kw.
 
Is This Answer Correct ?    246 Yes 27 No
Nikunj
 
  Re: Why Transformer in KVA?
Answer
# 4
Since Transformer is a Static device and it is having two
losses namely core loss and Cu loss. The core loss depends
on the Voltage (V) only, where Cu loss depends on Current
(I) only.So for this purpose the transformer always called
its rating in apparent power only(VA).
 
Is This Answer Correct ?    146 Yes 21 No
Padmanaban
 
  Re: Why Transformer in KVA?
Answer
# 5
Because transformenr is used for converting voltage level
only and nothing therefore its rating is in KVA i.e. KV x
Amp It gives us rating/capacity of transformer how power it
can handle.
The equipments not meant for consuming power are rated in
KVA units & those consuming power are rated in KW.
 
Is This Answer Correct ?    16 Yes 68 No
Dileep
 
  Re: Why Transformer in KVA?
Answer
# 6
The instruments which converts energy from one form to
another, rated in KW like motor etc which keeps same form
of energy will be rated in KVA like Transformer,stabilizer
etc
 
Is This Answer Correct ?    9 Yes 52 No
Amol
 
  Re: Why Transformer in KVA?
Answer
# 7
While designing the transformer manufacturer dosenot know
the load power factor.
 
Is This Answer Correct ?    26 Yes 42 No
Sachin
 
  Re: Why Transformer in KVA?
Answer
# 8
The leading/lagging power factor has
magnetizing/demagnetizing effect on armature reaction in a
rotating electrical machine. Hence the losses depends on
the load power factor. Unity PF has neither magnetizing nor
de-magnetizing effect.

Whereas in a transformer, the power factor doesn't play any
role in machine losses i.e. Cu & core losses are
independent of power factor.

Hence the rating of transformer is always given in KVA and
the rating of generators is given in kW at certain pf i.e.
usually at 0.8 lag.
 
Is This Answer Correct ?    27 Yes 11 No
Pankaj Rajput
 
  Re: Why Transformer in KVA?
Answer
# 9
bcoz ..cu loss depends the current.iron loss depends the
voltage..so that total loss of transformer is depends
voltage,current...so the transformer ratings in KVA..
 
Is This Answer Correct ?    49 Yes 11 No
Saravana Babu
 
  Re: Why Transformer in KVA?
Answer
# 10
because its power factor depend on the other load. 
Is This Answer Correct ?    15 Yes 21 No
Rakesh
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
If connected load of Asphalt plant is 375Kw. What suitable KVA DG set is required. What is calculation formula. what extra load have to consider. in what efficiency it will work. MAHINDRA 8
What are the condition for parallel operation of transformers? Alfanar 2
Is it mandatory statutory requirement of transformer oil filtration annualy despite oil is withstanding required dieelectrical strenth and all others parameters   5
what is deffrent alternatid and gernater   2
Why Delta Star Transformers are used for Lighting Loads.   6
Why NGR is required for 11Kv geneartor in power plant ABB 2
What is the different between buchholz relay and pressure relief device?   1
How we can calculate what type of supply we need for an example sometimes we take 11 KV and sometime 33KV from EB ?   4
what is the maximum demand how it is defined   1
How to differentiate 220 Kv & 132 Kv line transmission tower if there are no specifications given on towers? Power-Grid 3
why ground clearance of EHV line is more than HV line??   1
Can i get some examples of mechanical devices?   1
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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