Answer / s.k.kiran kumar

An autotransformer has a single winding with two end
terminals, and one or more terminals at intermediate tap
points. The primary voltage is applied across two of the
terminals, and the secondary voltage taken from two
terminals, almost always having one terminal in common with
the primary voltage. The primary and secondary circuits
therefore have a number of windings turns in common.Since
the volts-per-turn is the same in both windings, each
develops a voltage in proportion to its number of turns. In
an autotransformer part of the current flows directly from
the input to the output, and only part is transferred
inductively, allowing a smaller, lighter, cheaper core to
be used as well as requiring only a single winding.

Answer / harmandeep singh chandi

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.

Answer / ramesh

all is right

Answer / suren

In ordinary transformer the flux linkage occurs due to the mutual induction principle whereas in auto transformers both the primary and secondary winding share the same winding,Hence auto transformer works in Self induction principle.

Answer / rahul

if there is an input to the autotransformer ?

Answer / james sunter

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Answer / divyaprabha

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.

Answer / a.kossay

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

In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree

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