Answer / purushoth.a

AUTO TRANSFORMER IS SINGLE WINDING TRANSFORMER

Answer / raviranjan kumar

An auto trnsformer with only one winding wound on a
laminated core. A part of this winding is common to
both primary and secondary side .
in an ordinary transformer,the primary and secondary
winding are electricallyfrom each other but connected
magnetically.
In an auto transformer the primary andsecondary wind-
ing are connected magnetically and electrically.

Answer / spandan

its has only one winding.

Answer / jiyaur rahman

Auto transformer is a transformer consist of single coil, of which primary voltage is constant but secondary voltage can be varied in different small steps.

Answer / syed razzaq

auto transformer has a common negative and tappings are
taken through positive,single winding is used.

Answer / ajinkya sonawane

Autotransformer has one winding. taping is providing to
that winding and by using that that taping we select the
range of autotransformer

Answer / vivekraj

A special form of transformer having one winding, a portion of which is common to both the primary and the secondary circuits. The current in the high-voltage circuit flows through the series and common windings .

The current in the low-voltage circuit flows through the common winding and adds vectorially to the current in the high-voltage circuit to give the common winding current. Thus, an electrical connection exists between high-voltage and low-voltage windings. Because of this sharing of parts of the winding, an autotransformer having the same kilovolt-ampere (kVA) output rating is generally smaller in weight and dimensions than a two-winding transformer. One possible disadvantage of auto-transformers is that the windings are not insulated from each other and that the autotransformer provides no isolation of the primary and secondary circuits.

Autotransformers of large sizes are used for interconnecting high-voltage power systems. They are used in small sizes for intermittent-duty starting of motors. For this use the motor is connected for a short time to the common winding voltage, and then connected to the full line voltage. Small, variable-ratio autotransformers are used in testing and as components of other apparatus

Answer / sagar yadav

An autotransformer (sometimes called autostep down transformer)[1] is an electrical transformer with only one winding. The auto prefix refers to the single coil acting on itself rather than any automatic mechanism. In an autotransformer portions of the same winding act as both the primary and secondary. The winding has at least three taps where electrical connections are made. An autotransformer can be smaller, lighter and cheaper than a standard dual-winding transformer however the autotransformer does not provide electrical isolation.

Answer / niranjana

auto transformer is an electrical transformer consists of single winding.
That is both primary and secondary act as a single core.
An autotransformer is not electrically isolated.
so low impedence because of less copper windings. due to this more current flows in the winding. this may cause damage.
It is used as a variable voltage transformer.
It is also used as a starter for synchronous and induction machines.

Answer / trk

Autotransformer consists of a single coil. Transformer
secondary is tapped from the same coil.There is no primary
to secondary isolation as in two winding transformers.It's
just like a variable resistor.

to improve the existing power factor whether capacitors have to be added in series or parallel.and why

3 Answers  

Hydro P.P. run @ 600 rpm,8pole, Nucler P.P @ 1500rpm 4 pole , ThermlP.P @ 3000 rpm 2 pole.Why this diffrence??? when we can generate electricity @ 600 rpm then Why we had incresed speed in NPP & TPP???

3 Answers  

what type of euse we should use ? 1- High resistance & low temperature 2- High temperature low resistance

2 Answers  

i need to give section engineer (electrical engineer) for RRB. Please suggest some book

0 Answers  

how LVDT works?

2 Answers  

power formula

1 Answers  

Master trip relay code no

2 Answers   TR,

IN 3 phase induction motor where we give i/p supply & how its working ?

2 Answers  

Why the motor take high starting current for long time(10- 15 sec) which is connected to Blower as compaire with a motor which is connected with pump with same rating?

2 Answers  

How can calculate HT side VCB? For example I have 1250 KVA load what will be HT side VCB Amp.range and what size XLPE cable I use for HT side.

2 Answers   NASSA, Orchid, SB Automation,

Define bibo stability.

0 Answers  

HOW WE CALCULATE CURRENT IF THERE ARE NOT PRESENT ANY AMMETER OR MULTIMMETER??????

0 Answers