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Question
What is auto transformer?
 Question Submitted By :: Rajendran.m
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is auto transformer?
Answer
# 1
A single coil using taps on the coil toprovide equivalent
primary and secondary characteristics.
 
Is This Answer Correct ?    122 Yes 29 No
Rajendran.m
 
  Re: What is auto transformer?
Answer
# 2
Auto Transformer is otherwise called variable voltage
transformer. The primary voltage is constant and the
secondary voltage is variable. Its is mostly used in AC and
DC motors for laboratrical purpose
 
Is This Answer Correct ?    119 Yes 44 No
Logesh.r
 
 
 
  Re: What is auto transformer?
Answer
# 3
auto transformer consists of only one winding .single
winding is used for both primary and secondary windings.in
this transformer windings are not electrically isolated and
in like ordinary transformer windings are electrically
isolated with each other.
due to single winding cost of this transformer is also less
and voltage regulation is also superior compared to other
transformers.
normally these auto transformers is used as variac that is
for voltage variation purposes.
For example if input voltage is 220v outpu can varied in
steps of 10v 20v 30v 40v etc...........
 
Is This Answer Correct ?    167 Yes 17 No
Kavitha
 
  Re: What is auto transformer?
Answer
# 4
An autotransformer is a tapped winding transformer that
changes the voltage available locally to the voltage
required by a particular load. Thus, a load may operate
anywhere around the world, as long as a transformer is
available to convert the local voltage to the voltage it
requires.
 
Is This Answer Correct ?    26 Yes 37 No
Divyaprabha
 
  Re: What is auto transformer?
Answer
# 5
An Ordinary Transformer consists of two windings called
primary winding and secondary winding.These two windings
are magnetically coupled and electrically isolated. But the
transformer in which a part of windings is common to both
primary and secondary is called Auto Transformer. These two
windings are not only magnetically coupled but also
electrically coupled.The input to the transformer is
constant but the output can be varied by varying the
tappings
 
Is This Answer Correct ?    55 Yes 15 No
Anil Kumar
 
  Re: What is auto transformer?
Answer
# 6
auto transformer has a different voltage level in the
secondary circuit.
 
Is This Answer Correct ?    44 Yes 9 No
Raja
 
  Re: What is auto transformer?
Answer
# 7
a transformer which consists of one winding alone is common
to both input and output sides is called as autotransformer
 
Is This Answer Correct ?    51 Yes 6 No
Vidhya
 
  Re: What is auto transformer?
Answer
# 8
auto tarnsformer is a two winding transformer called common
and series winding the common winding is the input and the
series is the out put it have two connection bost and
bucking connection its advantges over the normal 2 winding
transformers is for the same kva the autotransformers
capacity is smaller losses and size is smaller, but its
main disadvantage is it only can be connected in delta-
delta only other connection is not possible
 
Is This Answer Correct ?    14 Yes 28 No
A.kossay
 
  Re: What is auto transformer?
Answer
# 9
auto transformer has a common negative and tappings are
taken through positive,single winding is used.
 
Is This Answer Correct ?    14 Yes 11 No
Syed Razzaq
 
  Re: What is auto transformer?
Answer
# 10
An autotransformer is an electrical transformer with only
one winding. The winding has at least three electrical
connection points called taps. The voltage source and the
load are each connected to two taps. One tap at the end of
the winding is a common connection to both circuits (source
and load). Each tap corresponds to a different source or
load voltage. In an autotransformer a portion of the same
winding acts as part of both the primary and secondary
winding.
 
Is This Answer Correct ?    26 Yes 2 No
Shiny Ayub
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
battery spicgravity mesuserd?   1
How to select Main CB Rating for 220 KW Load? Voltech 3
on what factor insulation resistance depends   2
Why generating voltage is limited up to 22kV?   4
effect of single phase transformer on full load current?   2
Transformer Secondary maximum current (max. load)   3
In three pin socket normally three pin in between three pins earthing point is more thickness why?   5
short notes on npn & pnp transisitor..........   5
What is CBCT ? Why & Where it is used?   8
Where the excitation is given either stator or rotor in actually in power plants?   12
what is boucholz relay and the significance of it in to the transformer?   2
why the auxilary(starting)winding is provided in single phase inductoin motor?   3
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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