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 closing resistor in circuit breaker? why it used?

3 Answers  

---

what is the meaning of powerfactor

6 Answers   NTP,

---

if the stetor speed (N S) increase by 20% then the rotor speed will be increased by 20% is it true. ?

4 Answers  

---

what are cable earthing and bus earthing trucks?when and where they are used?

1 Answers  

---

Then what do you call a transformer that is installed on the ground?"

1 Answers  

---

What is core balancing in Power Transformer. What is the affect of an unbalabce core.

1 Answers  

---

Diode is active or passive element?

14 Answers   Infosys,

---

What is acsr cable and where we use it?

0 Answers  

---

what is the applicatyons of the slipring motor and please tel me more about the slipring concept

1 Answers  

---

What will be happend if we not ground CT secondary?

3 Answers   Enercon, Engro, THDC,

---

In Power transformer oil temperature or winding temperature will be high

3 Answers  

---

what is arc flash and what are the hazards involved

0 Answers   Reliance,

---