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.

In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

0 Answers  

please anybody help me to find out the BHEL trainee Exam previous year questions papers . if u ve pls. send it to surekhared@gmail.com

0 Answers   Bhel,

what is the cable capacity of any load wise .

2 Answers  

HOW CALCULATE MOTOR KW, IF MOTOR NAME PLATE MISSING, WE FIND ONLY MOTOR WINDING RESISTANCE ONLY

1 Answers  

why dhyedration test required for transformer oil once in a year

1 Answers  

What is the high series capacitance winding on high voltage power transformer ?

0 Answers  

what are the losses of capacitor??

1 Answers  

How Much Capacity of Diesel Genset is suitable for 20 no.s of 1.5ton AC's & Why?(Load Calculation)

11 Answers   Lapis Technologies,

why ct ratio always rated 5.

1 Answers  

To make a basic instrumentation amplifier, it takes A One op-amp with a certain feedback arrangement B Two op-amp and seven resistors C Three op-amps and seven capacitors D Three op-amps and seven resistors

0 Answers  

what is the difference beteen differential protection and over current protection of an alternator

2 Answers   GVK,

1.difference between sts & ats? 2.what is fm200 system brefly explain?

1 Answers   Ericsson,