Answer / sowmya

actually both mean the same and may differ in some cases.....
because both are used to vary the voltage....

Answer / sajid m

auto transformer secondary is provided by taps that are
fixed in the winding but varic secondary voltage is providig
a sliding tip along the all of winding

Answer / ch.phani

autotransformer is just like a normal transformer provided
with tappings
but with variac any variation in the given range is possible
for example a 230v/270 v variac is used to vary the voltage
in range of (0-270)v

Answer / sunil datta

An auto transformer operates automatically and variac
manually.

what is the basis for selection of Protection CT class ? How anyone can decide whether to go for 5P10 or 5P20 ?

3 Answers  

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If we have 15000kw connected load in a factory than how much power demand sanction should be taken from electricity board. Pls provide complete calculation.

3 Answers  

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What is the difference between voltage and emf ?

3 Answers   DRDO,

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4 Answers   RRB,

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how  do you choose the cable size as per amps rating & the voltage drop for the same.

0 Answers   C&W,

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What is the effect of earth capacitance

3 Answers  

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reason of diode failure in alternator

0 Answers   adag,

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8 Answers   IGT,

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7 Answers  

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0 Answers  

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why we used star delta starter for above 5hp motors

2 Answers  

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what is the function of Droop CT and where it is used?

3 Answers   Lanco,

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