Follow Our FB Page << >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...

What is auto transformer?

Answers were Sorted based on User's Feedback

What is auto transformer?..

Answer / kavitha

auto transformer consists of only one winding .single
winding is used for both primary and secondary
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
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 ?    173 Yes 17 No

What is auto transformer?..

Answer / rajendran.m

A single coil using taps on the coil toprovide equivalent
primary and secondary characteristics.

Is This Answer Correct ?    124 Yes 30 No

What is auto transformer?..

Answer / logesh.r

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 ?    122 Yes 44 No

What is auto transformer?..

Answer / vidhya

a transformer which consists of one winding alone is common
to both input and output sides is called as autotransformer

Is This Answer Correct ?    52 Yes 7 No

What is auto transformer?..

Answer / anil kumar

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

Is This Answer Correct ?    57 Yes 15 No

What is auto transformer?..

Answer / raja

auto transformer has a different voltage level in the
secondary circuit.

Is This Answer Correct ?    46 Yes 9 No

What is auto transformer?..

Answer / shiny ayub

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

Is This Answer Correct ?    27 Yes 2 No

What is auto transformer?..

Answer / ayub rahman

The autotransformer has only one winding. In this special
kind of transformer a portion of the winding is common to
both the primary and secondary one.

The principle of operation of the autotransformer is the
same as the one of the common transformer, and then the
relation between input and output voltages and input and
output currents and the ratio of number of turns between
the primary and the secondary winding is the same.

The currents of the primary and secondary windings are
flowing on the opposite directions, so the total current
flowing through the common part of the winding is equal to
the difference between the current on the low-voltage
winding and the current on the high-voltage winding.

In order for an autotransformer to work properly, the two
windings should have the same winding sense.

Is This Answer Correct ?    18 Yes 1 No

What is auto transformer?..

Answer / riyaz kamaal

autotransformer is a variable voltage transformer.

Is This Answer Correct ?    14 Yes 0 No

What is auto transformer?..

Answer / debika

interconnecting transformer is called auto transformer

Is This Answer Correct ?    11 Yes 1 No

Post New Answer

More Electrical Engineering Interview Questions

Can you please explain creepage distance in detail, for a 6.6kV cable head what must the distance be and how do you determine it?

0 Answers   Prism Cement,

We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

0 Answers  


1 Answers   L&T,

can we use metering current transformer as protection current transformer if not why? & if yes why?

5 Answers   Wartsila,

What happen to alternator if prime mover fails?

4 Answers  

How to select cable the size, what is the parameters use and what is the formulas use for this cable size calculation?

0 Answers  

how we explain parallel paths armature winding?

0 Answers  

what are the different pre- commissioning tests performed on distribution transformer, power cable and switchgear?????

1 Answers   Reliance,

What is hipot test procedure?

0 Answers   CCC,

A separately excited dc motor having 2 ohm armature resistsance draws a current of 10A and torque developed is 20 Nm under rated field condtion. the speed of the motor under the rated field condtion , when it is connected to a 100V DC source and delivering 10Nm torque....

2 Answers   DRDO,

How does HT work & Voltage required?

0 Answers   Adhunik,

If increased the frequency up to 1000 then what changes shows in voltage?

0 Answers  

  • Civil Engineering Interview Questions Civil Engineering (5081)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4448)
  • Electrical Engineering Interview Questions Electrical Engineering (16620)
  • Electronics Communications Interview Questions Electronics Communications (3915)
  • Chemical Engineering Interview Questions Chemical Engineering (1093)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (214)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (258)
  • Instrumentation Interview Questions Instrumentation (2994)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (123)
  • Power Plant Engineering Interview Questions Power Plant Engineering (171)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (0)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)