Answer / veeru

it is working on the self induction principle but where as
normal t\f works on the principle of mutual induction.it has
only one winding

Answer / raji g

AN AUTO TRANSFORMER IS A SINGLE CORE TRANSFORMER COPPER
WINDINGS ARE WOUNDED ON THEM
WE CAN USE THIS TRANSFORMER WHERE WE WANT REDUCE THE THE
SUPPLY VOLTAGE AND ALSO INCREASE THE VOLTAGE.


eg. LABORATORIES

Answer / kotike chaitanya bharghav

In auto transformer
we can reduce the amount
of copper but in the case of
normal 2 winding t/r
require more copper for
winding
and also there is lot of
losses in normal transformer

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

0 Answers  

---

what is the speed of the darkness?

3 Answers   Wipro,

---

How to PLC give the command to electrical

1 Answers  

---

what are the protection for DG set and why?

2 Answers  

---

Seamless tubes are made by?

5 Answers   Bhel,

---

---

what reason of line current and phase current in star connection and line current and phase current not equal in delta connection?

0 Answers   Suparco,

---

what do you mean by mf of energy meter & its formula?

4 Answers  

---

how electical engineer is related to apsrtc (general) post? if they ask a question in interview as why did u choose this job what shd be answer

0 Answers  

---

How to measure size of cable on a given load

0 Answers   Green India Engineering Solutions,

---

Please tell me the power flow from pmg to main rotor of an alternator (Including AVR unit)?

0 Answers   Hindalco,

---

what is the definition of a power transformer ?

4 Answers  

---

How to calculate the Sizes of the cable required for one specific load? Is there any formula for that? ( EX: For 400KW load,50mtr Length, What is the LT cable Size required?)

2 Answers   Texmo,

---